Advice requested on GIMP version to install

[david]

Rich,
Many thanks, but I am still failing.
I extracted the appimage to a folder - GIMP-2.10.21 - (in Home).
In the .desktop file I have tried:
Exec=~/david/GIMP-2.10.21/squashfs-root/AppRun and
Exec=home/david/GIMP-2.10.21/squashfs-root/AppRun
without success. I think it is probably time to give up despite your efforts on my behalf.
david.