So, if I see that correctly, this is the table of affected user bases
| | Win | Mac | Linux | |---| :---: | :---: | :---: | | Squeak <=5.3, disableDeferredUpdates: true | ✅ | ✅ | ✅ | | Squeak <=5.3, disableDeferredUpdates: false | ✅ | ❌ | ✅ | | Squeak <=5.3, updated via update map | ✅ | ✅ | ✅ | | Squeak 6 alpha, not updated | do not use | do not use | do not use | | Squeak 6 alpha, updated | ✅ | ✅ | ✅ |
Please note that the Mac user base is by far the smallest nowadays.