Hi don570,
Glad that you found us.

Edit: I'm currently running Bionicpup64. As far as I can tell, the newer versions of krita (from 4 on) require qt5 libs; the one you linked to qt5 subversion 12. Obtaining them under Bionicpup64 is possible, but time-consuming. I don't really use Krita, but --on the theory I'll get around to learning this someday-- have the krita-3.3.3-x86_64.appimage in my /mnt/home/Pup-Apps* folder. It can be obtained here https://krita.org/en/item/krita-3-3-3/ and does not require the newer libs.
With the gmic appimage also on /mnt/home/Pup-Apps, editing a couple lines in the script as follows:
cd /mnt/home/Pup-Apps*
LD_LIBRARY_PATH= ./gmic_krita_qt-x86_64.appimage &
...
cd /mnt/home/Pup-Apps*
LD_LIBRARY_PATH= ./krita-3.3.3-x86_64.appimage
krita with gmic opens.
Naming the script krita-gmic, it can be located (and easily found) adjacent to the krita.appimage. On /mnt/home it uses no RAM when not opened, and perhaps can be used by other Puppies file-browsing and left-clicking the script. If desired, a pet can add it to Start menus or it can be dragged to desktops.
Thanks again. I had no idea how to get any krita.appimage to make use of the gmic.appimage.
* I keep all AppImages in a folder named Pup-Apps which makes them easier to find especially as I can add a bookmark to the folder in rox.