“Gimp is good but i miss the heal patch” …not really.
Resynthesize is a heal selection plugin you can add to Gimp. With many software store manager like the one from Linux Mint all you have to do is simply to add the additional components in the software page
Otherwise you can download it from github and add it to your plugin folder following this guide
https://www.arkthinker.com/edit-image/remove-the-watermark-with-gimp/
https://github.com/bootchk/resynthesizer
once installed you can find it in Filters> Enhance > Heal section
what about the appimage?
Not sure. I’d assume its the same as the flatpak with a bit more work involved in deconstructing the apk file, adding the plugin to the proper folder and then recompiling.