I suggest using something other than 7zip or use the app itself to play the game.
https://itch.io/app
Thanks, I'll give that a shot when I have the time.
Cheers!
Problem solved: it seems my 1TB remote drive's file system got corrupted—how I don't know—but when I moved everything to another drive it all went tickety-boo.
Glad you got it figured out!
