There is finally an AppImage version of Bforartists available. Many thanks for the enourmous help with that. The recipe was created by the folks from AppImageCrafters.
github.com/AppImageCrafters/bforartists-appimage
The AppImage version of Bforartists is created at an Ubuntu 20.10. But showed already that it works at Ubuntu 20.04 too. And it should also work on Debian, Arch, Fedora and CentOs and their derivates too.
The AppImage version is currently in Beta.. Please report any issues that you have with it. You can find it in the downloads section.