At one time I made a pre-gimp 2.10 appimage using the ubuntu PPA, so I have utmost respect for aferrero's Gimp appimage which is a tremendous piece of work.
Pro's & Con's for unpacking.
When the Gimp appimage is run it is unpacked to the root directory /tmp Lots of files - 10,000 - occupying 505 MB All deleted when Gimp is closed. If you only run Gimp occasionally, use it that way, If you use Gimp several times a day, unpack and run from disk ( or alternatively never close Gimp)
Up to the user.
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gimp_gmic_qt The clue is in the name. The appimage-with-plugins or the plain version with the gmic appimage installation contains the necessary QT5 library files. The appimage uses an older QT5 version 5.9.7 whereas a 'buntu 20.04 is now up to ver. 5.12.8 You need a compatible plugin, which is probably why the appimage version is still on gmic 2.9.2 . It is worth trying a plugin that is build using that older QT5. I keep some here:
https://www.gimp-forum.net/Thread-gmic- ... untu-18-04 Put the plugin in the appimage profile
~/.config/GIMP-AppImage/2.10/plug-ins/ Works here but as usual no guarantees.
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Just a note about appimage version, the development versions (odd numbers) ie. 2.10.25 are auto generated weekly on a Thursday. (Unless the Gimp developers throw a spanner in the works with updated dependencies) That 2.10.25 (2021-04-01 ) is so close to the stable release it is 'defacto' the same as 2.10.24 AFAIK the stable versions (even numbers) ie. 2.10.22 are hand assembled by aferrero, so you need to be patient.