You shouldn't be downloading the game through the itch.io launcher or whatever it is, if you are. The game is incompatible with it, and while it might've worked on the last version, the home page of the game says to use 7zip to extract the game.
ive had no problems with 8.2 on itch, also you still need to unzip the files even if you have it on itch.io. ive had the same problem, when you click on download next to '[UNSTABLE SHADOW SUPER TEST] Alpha 0.9.0 [0015_1]2 GB' it just says there is no compatible download. wanna play the new update but cant get it to work outside of itch.io. best bet (if you know how to get it to work) is to download it off of the website, instead of the app.