One question, what do I do when I download the program so that it opens correctly?
on windows, you just unzip the downloaded file wherever you'd like, and open veadotube mini.exe :] just make sure you unzip it (don't open the exe file directly from winrar/7zip) and you should be fine.
on mac, simply opening veadotube mini.app should work! that or explicitely right-clicking it and selecting Open. there are known issues with big sur where it says you don't have permission to open the app, still no solution for now but i'm looking into it.