Yep, I'd love to take a look at your entire app log! You can find it in %APPDATA%/itch/logs
I'd also like you to: close the app completely (Ctrl+Q) go to %APPDATA%/itch and completely remove the `bin` folder, then start the app again, see if anything different happens.
3221225477 means "Access Violation", I haven't seen it before for unarchiver, so I'm really curious which version of Windows you're running, if you have a 32-bit or 64-bit processor (and windows installation), etc. Also if you have any antivirus software installed. Thanks!