[doubletwoyou]

One way to get the AppImage to integrate better would be to install appimaged.

Another way to get the up-to-date version on Debian would be to use Nix (install nix, add the stable or unstable channel or whatnot, and make darktable installable)

[Groxx]

GearLever is handy too, though they seem moderately different in goals and I'm not familiar with the details