I've put some older versions up on my site here, please let me know once you have them as I'd rather not leave them out in the open on my webhost right now. If one does work I can make it available on itch.
As for what is causing the issue, it sounds like it's actually an input problem - as if the app thinks you're holding the esc and tab keys down. You might be able to get around it by disconnecting your keyboard (and/or gamepad, if the keyboard isn't the issue). If the flashing stops when the UI is visible, you should be able to go to Settings > Control > Configure Inputs and unbind "Cancel" and "Toggle UI". You should be able to do this with just the mouse.