I can’t speak to Catalina, but for the same problem on Mojave, run xattr -cr on it in Terminal. (For the uninitiated: Open up Terminal [it’s an app that came with your Mac], type that command and then a space, drag AIdol.app onto the same Terminal window, and press return.)
I was also able to run it without doing that by launching AIdol.app/Contents/MacOS/lib/AIdol directly.