Hello, I liked the idea of the program, but I want a Linux version AppImag

This is a plugin for Adobe After Effects. Not a stand-alone software that can be put into a linux AppImage unfortunately.

Thank you very much.

If you wish for a standalone version of this program though, maybe check out this free plugin for aesprite?
https://thkaspar.itch.io/fx/devlog/810691/update-v400-color-outline