The appimage has the G'MIC-QT entry bottom of the Filters menu but greyed-out?
You need an image open - a blank canvas will do
The Gimp 2.8.22 is completely separate from the appimage. Any plugins go in the user profile ~/.gimp-2.8/plug-ins
The appimage user profile is separate ~/.config/GIMP-AppImage/2.10
You need an image open - a blank canvas will do
The Gimp 2.8.22 is completely separate from the appimage. Any plugins go in the user profile ~/.gimp-2.8/plug-ins
The appimage user profile is separate ~/.config/GIMP-AppImage/2.10