The notes there say that everything works except that the canvas flickers. Sounds minor but probably makes it unusable. Probably best to install it in a Windows VM if you need it. The Affinity stuff is very good.

I don’t understand your comment. Steganography in computing is about hiding messages inside other media, but this doesn’t in itself achieve any kind of encryption. The current discussion is about encryption, and whether it should have backdoors (the answer is no). Even if you hide your message in an image or video file, you still face the question of how to encrypt it. So steganography seems orthogonal to the debate about encryption.