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I've been a fan of Sierra games since 1988 when I bought a Tandy 1000SX as my first high school computer and picked up the Sierra Value Pack with Thexder, Helicopter Simulator, and Space Quest II at the same time. So when I first started playing around with old Macs in the late 90s (when they were dirt cheap and easy to find), I quickly found out that the Sierra AGI games were not well supported in the Macintosh world.
UPDATE: 2020-08-11, I was finally able to confirm Dr. Zeissier's find, Larry 1 AGI 2.06 released Feb 4, 1991 works in 16 colors on 7.5.5 in 24 bit memory mode (partially works in 32 bit memory mode). Only the interpreter was updated all other files are from 1987 with the exception of palette file from early 1988 …. so there 'may' be other updated versions of the AGI games out there, or this may be a way to figure out what was changed and make a fix. I'll be updating this entry in section 3 as I experiment with what the 2.x interpreter versions will or will not work on.
1. Reconstructed the timeline for Macintosh AGI releasesWhen Sierra first started making their Adventure Game Interpreter (AGI) games available for the Macintosh in 1987, they were originally only available as Black and White (1bit) versions. By reading scans of Sierra's old newsletters and back issues of MacWorld I've been able to piece together an approximate timeline for when the various AGI games were made available…. and when they stopped being produced.
Mac Sierra Dmg DownloadSeptember 1987, Kings Quest I, Kings Quest II and Space Quest (b&w) were first listed for sale from MacConnection in MacWorld
Fall 1987, Sierra's Newsletter Volume 1 No. 2 lists the above games and Kings Quest III (b&w), The Black Cauldron, Leisure Suit Larry (b&w), a 3-d Adventure Demo Disk, Sierra Championship Boxing and Donald Duck's Playground (?) as available (figure 2). This and the price list from their 1987 inbox catalog are the only mention I've found of Donald Duck's playground, on December 31, 1987 Sierra's contract with Disney expired and they ceased production of this game. I have yet to find a copy.
The Black Cauldron entry must have been included by mistake, or unexpectedly delayed, the next few newsletters always have it listed as coming in a future quarter (see figure 5 below), and from what I can find it was never released, last appear as coming soon in fall of 1990 (figure 11) 
I've yet to find a copy of the Macintosh version of the 3-d Demo disk.
They also announce that Leisure Suit Larry will be their first Color Macintosh title (figure 3)… but they later include Leisure Suit Larry in the list of games to be converted to color…. (see figure 6). Based on the upgrade information in Sierra's 1990 Spring Newsletter Volume 3 Number 1 (figure 10) for version 1.05, I'm assuming that version 1.0 was b&w with the offer to upgrade to color.
The Newsletter also includes an offer for owners to send in their original disks to get the latest patched versions of King's Quest I (2.0C), King's Quest II (2.0R), King's Quest III (2.0) and Space Quest I (1.5D). I assume that means there were one or more earlier versions released for each of these titles. (figure 4) 

December 1987, Leisure Suit Larry I v1.0 (b&w and 16 color?) was first listed for sale from MacConnection in MacWorld, with a review in the same issue.
January 1988, Kings Quest III (b&w) was first listed for sale from MacConnection in MacWorld
Spring 1988, Sierra's Newsletter Volume 1 No. 3 adds Police Quest I: In Pursuit of the Death Angel (b&w) and Mixed up Mother Goose to Sierra's price list. (figure 5 above)
May 1988, Police Quest I (b&w) was first listed for sale from Programs Plus in MacWorld
November 1988, Mixed Up Mother Goose (b&w) was first listed for sale from MacConnection in MacWorld
End of 1988, Sierra announced in their 1988 Winter (end of 1988) Newsletter, they would be releasing 16 color (4bit) versions of the previously released b&w games in support of the new Macintosh II (figure 6). They also added several games to their price list (figure 7) for future releases, many of which were not: Kings Quest IV, Police Quest II, the Black Cauldron, and Leisure Suit Larry II were all never released. 
Feburary 1989, Space Quest II (b&w and 16 color) was first listed for sale from Programs Plus in MacWorld. MacWorld also had a brief description showing the 16 color version in the same issue (figure 8).
March 1989, the Police Quest I color re-release was reviewed in Macworld, along with a review of Space Quest II.
April 1989, the new 16 color versions of the original b&w only games are finally advertised for sale by MacConnection in MacWorld. (figure 9)
September 1989, GoldRush! (b&w and 16 color) was first listed for sale from MacConnection in MacWorld
Fall 1989, Sierra's Fall Newsletter Volume 2 Number 2 adds Goldrush! and Manhunter I : New York (b&w and 16 color) to it's price list, the Black Cauldron (never released) was removed from their price list.
October 1989, Manhunter I and Silpheed (not an AGI game) were first listed for sale from Programs Plus in MacWorld.
Spring 1990, Sierra's Spring Newsletter Volume 3 Number 1 includes an offer for owners to send in their original disks to get the latest patched versions of Gold Rush! (v2.01, i1.78), King's Quest I (v2.0C, i1.50), King's Quest II (v2.0R, i1.50), King's Quest III (v2.14, i1.52), Leisure Suit Larry (v1.05, i1.55), Manhunter New York (v1.22, i1.79), Space Quest I (v2.2, i1.64), and Space Quest II (v2.0F, i1.73) (figure 10). Most of the versions were created to add support for color. Manhunter II was added as available in their price list.
May 1990, Manhunter II: San Francisco (b&w and 16 color) was first listed for sale directly from MacConnection in MacWorld
September 1989, Apple releases the Macintosh IIci, and begins including 32-Bit QuickDraw in ROM for all future Macintosh systems.
Summer 1990, Sierra's Summer Newsletter Volume 3 Number 2 includes:an article about their first 10 years, which includes a statement about their investment in the Macintosh with black and white games did not pay off, and a move to focus on SCI. 
there is also mention of a issue with 32-bit Quickdraw on the Macintosh and some sierra games, (see Figure 13 for an example) but with a comment that the issue will be eliminated with their new SCI products…. 
the price lists shows the remaining AGI games as coming in the winter. And the list of patched versions appear to be the same as those from the spring (figure 10)
Fall 1990, Sierra's Summer Newsletter Volume 3 Number 3 contains the last complete price list (figure 11) and last list of patched versions for AGI games on the Macintosh which appear to be the same as those from the spring (figure 10). 
Spring 1991, Sierra's Spring Newsletter Volume 4 Number 1's price list no longer includes Macintosh AGI games for sale.
But? Summer 1992, Sierra's Summer 1992 Newsletter Volume 5 Number 2 price list for Macintosh includes Kings Quest I, II and III, and Space Quest II (figure 12). This appears to be the last time any Macintosh AGI games are listed for sale by Sierra. Did this mean that there were some later versions of Sierra AGI games that fixed the 32-bit QuickDraw issue found in 1990…. or did Sierra sell these knowing they wouldn't work on many systems?
That's it, Manhunter II seems to be the last AGI sierra game ever released for the Macintosh. King's Quest IV, Police Quest II, Leisure Suit Larry II were never released.
2. 32-Bit QuickDraw killed AGI?All of the Sierra AGI games that support 16 colors suffer from the same problem, when you try to play them in color on anything other that an early Macintosh II system, you see a screen similar to figure 13 above, making the game unplayable in color.
Based on the response to the issue with 32-Bit QuickDraw (New Mac Users Encounter a Mysterious Phenomenon, page 29), in Sierra's Summer 1990 Newsletter Volume 3 Number 2, it appears that Sierra's AGI games were incompatible with changes made when Apple moved from the 24 bit version of Color Quick used by early Macintosh II systems to the 32 bit version built in to ROM starting in the IIci, and all future color Macintosh systems.
What's not clear to me, with the final sale of some games 2 years later in 1992 (figure 12) , did Sierra fix the problem, or did they try to sell off games they knew wouldn't work on newer color Macintosh Systems?  See section 3, it appears the problem was fixed, at least for Larry 1, now just need to see if it was fixed for anything else.
So far I haven't found a color version that works on anything other than a Macintosh II system.. but someone else appears to have Space Quest II 1.51 running in color on a Quadra 700, the copy appears to be from the Macintosh Garden, and the Quandra appears to use 32-Bit QuickDraw? I've tried this same version on my LC475 and experienced the issue shown in figure 13, so I'm not sure why this works on the Quadra 700 but not on other systems? Update 2020-08-11, it could be that the AGI interpreter was updated, but the game version stayed the same. That appears to be the case for the 'fixed' Larry 1 release. See section 3.
At the moment, your best bet to play a Sierra AGI game in color on a Macintosh is either a real Macintosh II (pre IIci), the mini vMac Macintosh II build, or to play the Apple II versions, on a compatible 68k Macintosh, using an Apple IIe emulator card, or Apple II emulation software. Mac dark red shades.
In the future perhaps someone with more time then I have might patch this issue, or create a Macintosh 68k version of Sarien or ScummVM.
3. Fixed? The Macintosh 2.x AGI interpretersDr. Zeissier posted he has found that Larry 1 running on AGI 2.06 works on his LC under 6.08 in 16 colours. I've done some of my own testing and confirm that it partially works under Basilisk under system 7.5.5, but crashes if you use the status menu. I tested on my LC 475 and found that I had the same crash as Basilisk under 32 bit mode, but was able to use the status menu when I switched my LC to 24bit mode. So I can confirm Larry AGI 2.06 works in 16 colours on my LC 475, running System 7.5.5 in 24 bit mode.
As more 2.x interpreters versions are found (date stamp 1991), I'll test them here. I also plan to see if I can determine what was edited between AGI 2.06 for Larry and AGI 1.55 for Larry to see if a patch can be made…
4. Summary table AGI releases for the MacintoshThere appears to be 2.x release of AGI that fixes the palette problem, currently the only confirmed copy is Leisure Suit Larry with AGI Version 2.06, coded by Mark Lanbehn of Fairfield Software.
The version numbers (and AGI interpreter version) in this table is based on the upgrade tables shown in Figure 4 and Figure 10, any mentions of versions in product reviews, and versions in my own collection. I'm still going through my collection using the Macintosh II emulator so I can actually load the games…. many crash on load on my LC 475.
Apple began transitioning to 64-bit hardware and software technology for Mac over a decade ago, and all modern Macs now include powerful 64-bit processors that can run advanced 64-bit apps. These apps can access dramatically more memory, enable faster system performance, and take advantage of technologies that define today's Mac experience.

December 1987, Leisure Suit Larry I v1.0 (b&w and 16 color?) was first listed for sale from MacConnection in MacWorld, with a review in the same issue.
January 1988, Kings Quest III (b&w) was first listed for sale from MacConnection in MacWorld
Spring 1988, Sierra's Newsletter Volume 1 No. 3 adds Police Quest I: In Pursuit of the Death Angel (b&w) and Mixed up Mother Goose to Sierra's price list. (figure 5 above)
May 1988, Police Quest I (b&w) was first listed for sale from Programs Plus in MacWorld
November 1988, Mixed Up Mother Goose (b&w) was first listed for sale from MacConnection in MacWorld
End of 1988, Sierra announced in their 1988 Winter (end of 1988) Newsletter, they would be releasing 16 color (4bit) versions of the previously released b&w games in support of the new Macintosh II (figure 6). They also added several games to their price list (figure 7) for future releases, many of which were not: Kings Quest IV, Police Quest II, the Black Cauldron, and Leisure Suit Larry II were all never released. 
Feburary 1989, Space Quest II (b&w and 16 color) was first listed for sale from Programs Plus in MacWorld. MacWorld also had a brief description showing the 16 color version in the same issue (figure 8).
March 1989, the Police Quest I color re-release was reviewed in Macworld, along with a review of Space Quest II.
April 1989, the new 16 color versions of the original b&w only games are finally advertised for sale by MacConnection in MacWorld. (figure 9)
September 1989, GoldRush! (b&w and 16 color) was first listed for sale from MacConnection in MacWorld
Fall 1989, Sierra's Fall Newsletter Volume 2 Number 2 adds Goldrush! and Manhunter I : New York (b&w and 16 color) to it's price list, the Black Cauldron (never released) was removed from their price list.
October 1989, Manhunter I and Silpheed (not an AGI game) were first listed for sale from Programs Plus in MacWorld.
Spring 1990, Sierra's Spring Newsletter Volume 3 Number 1 includes an offer for owners to send in their original disks to get the latest patched versions of Gold Rush! (v2.01, i1.78), King's Quest I (v2.0C, i1.50), King's Quest II (v2.0R, i1.50), King's Quest III (v2.14, i1.52), Leisure Suit Larry (v1.05, i1.55), Manhunter New York (v1.22, i1.79), Space Quest I (v2.2, i1.64), and Space Quest II (v2.0F, i1.73) (figure 10). Most of the versions were created to add support for color. Manhunter II was added as available in their price list.
May 1990, Manhunter II: San Francisco (b&w and 16 color) was first listed for sale directly from MacConnection in MacWorld
September 1989, Apple releases the Macintosh IIci, and begins including 32-Bit QuickDraw in ROM for all future Macintosh systems.
Summer 1990, Sierra's Summer Newsletter Volume 3 Number 2 includes:an article about their first 10 years, which includes a statement about their investment in the Macintosh with black and white games did not pay off, and a move to focus on SCI. 
there is also mention of a issue with 32-bit Quickdraw on the Macintosh and some sierra games, (see Figure 13 for an example) but with a comment that the issue will be eliminated with their new SCI products…. 
the price lists shows the remaining AGI games as coming in the winter. And the list of patched versions appear to be the same as those from the spring (figure 10)
Fall 1990, Sierra's Summer Newsletter Volume 3 Number 3 contains the last complete price list (figure 11) and last list of patched versions for AGI games on the Macintosh which appear to be the same as those from the spring (figure 10). 
Spring 1991, Sierra's Spring Newsletter Volume 4 Number 1's price list no longer includes Macintosh AGI games for sale.
But? Summer 1992, Sierra's Summer 1992 Newsletter Volume 5 Number 2 price list for Macintosh includes Kings Quest I, II and III, and Space Quest II (figure 12). This appears to be the last time any Macintosh AGI games are listed for sale by Sierra. Did this mean that there were some later versions of Sierra AGI games that fixed the 32-bit QuickDraw issue found in 1990…. or did Sierra sell these knowing they wouldn't work on many systems?
That's it, Manhunter II seems to be the last AGI sierra game ever released for the Macintosh. King's Quest IV, Police Quest II, Leisure Suit Larry II were never released.
2. 32-Bit QuickDraw killed AGI?All of the Sierra AGI games that support 16 colors suffer from the same problem, when you try to play them in color on anything other that an early Macintosh II system, you see a screen similar to figure 13 above, making the game unplayable in color.
Based on the response to the issue with 32-Bit QuickDraw (New Mac Users Encounter a Mysterious Phenomenon, page 29), in Sierra's Summer 1990 Newsletter Volume 3 Number 2, it appears that Sierra's AGI games were incompatible with changes made when Apple moved from the 24 bit version of Color Quick used by early Macintosh II systems to the 32 bit version built in to ROM starting in the IIci, and all future color Macintosh systems.
What's not clear to me, with the final sale of some games 2 years later in 1992 (figure 12) , did Sierra fix the problem, or did they try to sell off games they knew wouldn't work on newer color Macintosh Systems?  See section 3, it appears the problem was fixed, at least for Larry 1, now just need to see if it was fixed for anything else.
So far I haven't found a color version that works on anything other than a Macintosh II system.. but someone else appears to have Space Quest II 1.51 running in color on a Quadra 700, the copy appears to be from the Macintosh Garden, and the Quandra appears to use 32-Bit QuickDraw? I've tried this same version on my LC475 and experienced the issue shown in figure 13, so I'm not sure why this works on the Quadra 700 but not on other systems? Update 2020-08-11, it could be that the AGI interpreter was updated, but the game version stayed the same. That appears to be the case for the 'fixed' Larry 1 release. See section 3.
At the moment, your best bet to play a Sierra AGI game in color on a Macintosh is either a real Macintosh II (pre IIci), the mini vMac Macintosh II build, or to play the Apple II versions, on a compatible 68k Macintosh, using an Apple IIe emulator card, or Apple II emulation software. Mac dark red shades.
In the future perhaps someone with more time then I have might patch this issue, or create a Macintosh 68k version of Sarien or ScummVM.
3. Fixed? The Macintosh 2.x AGI interpretersDr. Zeissier posted he has found that Larry 1 running on AGI 2.06 works on his LC under 6.08 in 16 colours. I've done some of my own testing and confirm that it partially works under Basilisk under system 7.5.5, but crashes if you use the status menu. I tested on my LC 475 and found that I had the same crash as Basilisk under 32 bit mode, but was able to use the status menu when I switched my LC to 24bit mode. So I can confirm Larry AGI 2.06 works in 16 colours on my LC 475, running System 7.5.5 in 24 bit mode.
As more 2.x interpreters versions are found (date stamp 1991), I'll test them here. I also plan to see if I can determine what was edited between AGI 2.06 for Larry and AGI 1.55 for Larry to see if a patch can be made…
4. Summary table AGI releases for the MacintoshThere appears to be 2.x release of AGI that fixes the palette problem, currently the only confirmed copy is Leisure Suit Larry with AGI Version 2.06, coded by Mark Lanbehn of Fairfield Software.
The version numbers (and AGI interpreter version) in this table is based on the upgrade tables shown in Figure 4 and Figure 10, any mentions of versions in product reviews, and versions in my own collection. I'm still going through my collection using the Macintosh II emulator so I can actually load the games…. many crash on load on my LC 475.
Apple began transitioning to 64-bit hardware and software technology for Mac over a decade ago, and all modern Macs now include powerful 64-bit processors that can run advanced 64-bit apps. These apps can access dramatically more memory, enable faster system performance, and take advantage of technologies that define today's Mac experience.
Apple has been working with developers to transition their apps, and in 2018 Apple informed them that macOS Mojave would be the last version of macOS to run 32-bit apps. Starting with macOS Catalina, 32-bit apps are no longer compatible with macOS.
If you get an alert about a 32-bit appYou will see one of these alerts when attempting to open a 32-bit app: 
[app name] needs to be updated.
The developer of this app needs to update it to work with this version of macOS. Contact the developer for more information.
[app name] is not optimized for your Mac and needs to be updated.
This app will not work with future versions of macOS and needs to be updated to improve compatibility. Contact the developer for more information.
Download Mac Os High Sierra From AppleWhen installing macOS, you may see a list of recently used apps that are 32-bit. You can review this list before deciding to continue installation. You may also see a prohibitory symbol over the icon of each 32-bit app in the Finder, letting you know that the app will not open.
Apple Mac Os Sierra DownloadFor all 32-bit apps, please contact the developer of the app to learn whether an updated version of their software is available or planned.