[Solved] gimp-2.9.9 AppImage Desktop Launcher installation FAIL

Software
3

It is the one here at the community-built software link. Community-built software

https://github.com/aferrero2707/gimp-appimage/releases/download/continuous/gimp-2.9.9-20180315_2132.glibc2.14-x86_64.AppImage

I have successfully used that .AppImage on two other computers without having created the desktop launchers. BTW, I am using Linux Mint 18.3 Sylvia MATE 64-bit on the failing computer, and 18.1 and 17.3 on the others. Thanks for your input in this matter.

Carl