There are two issues here, one is that updates are intentionally disabled. Technically it was unintentional, but I don't want it to be fixed yet because of the second issue, which is that the 91.0 mac version doesn't work. It crashes in weird ways every time you attempt to open a save.

There is a fixed version though! Please download this version manually: http://starcatcher.us/TPT/Download/Snapshot.dmg


Also about your stamps, that is because OS X support isn't very good ... but you can fix it easily if you still have the stamps. Go into the folder with Powder.app and there should be a stamps/ folder. Merge all of the items into the new stamps directory, which you can find by clicking "Open Data Folder" in simulation settings. Then go into the stamp browser in game and hit "rescan stamps". This will cause it to find all the stamps you just copied into the new location.

@pepper1boy (View Post)
Oh? Can you give more information on why it isn't supported? I don't know much about macs, it should work on any version of OS X >= 10.6 (the previous version worked on 10.5 possibly but i'm not sure)

@pepper1boy (View Post)
Can you look at this and tell me which version of OS X you are on? https://support.apple.com/en-us/HT201260

Some of the other info in there could also be useful.