hey i'm having the same problem and i'm on mac too... from experience it could just be that we're using macs, they dont seem to load up stuff on here well
edit: i think i fixed it you could try this . open the file in a new tab, open the contents, open macOS, than open PNGTube-remix exec thing (idrk the name of it lol) and uhm yea it should open and say debug!
I don't know HOW this worked but it did!! I had a copy of the app in my downloads folder so I did what you said first, but it was giving me the "the application is damaged" prompt so I moved the app to my desktop, did the terminal fix, opened it up again, and it WORKED!!
For those reading in the future, if it's giving the "This application is damaged and cannot be opened, move it to the trash" prompt on MacOS, try this in terminal:
xattr -d com.apple.quarantine /path/to/app.app
Thanks again!! :)
