Haven't played since February 2021, just tried to load the game today to play some. Getting the above error when loading the most recent dozen or so saved games. Older save games load just fine.

Argh, how do you attach images so they appear?

And you have not reinstalled the game or anything? For some reason I can see both the base game and GOTY edition in my library.

And I assume you have checked you have all the DLCs installed? If this is the case, try to verify the files.

In GOG Galaxy 2.0 select the game, from the top menu the settings button next Play/Install > Manage Installation > Verify / Repair.

To attach files, click attach > Select File > select the image you want to attach. If you want another file, click attach again, Select File (don't worry that the previous file won't show when the Select File is visible), then select another file. As a sample I just attached two random images to show it works.

Tried attaching using "attach" but nothing actually gets attached.

Yes, I tried the Verify/Repair and also uninstall and reinstall, but no dice.