Is the 32-bit version no longer supported/available? I have both 64 and 32 bit versions for 1.1.4.2, but missed the 1.1.5.0 update so don't know if there was a 32-bit version then. I'm looking at the offline installers.

Game still supports both versions. You need 1.1.5.0 installed though is my guess. May need to download the whole game again if there's no offline installer for 1.1.5.0, though there should be I think. GOG handles that so contact them if you can't find it.