Original version did not work for me. So i tinkered until everything seemed to work. Please try it, if you are on Linux. Made a fork, cause i don´t want to interfere with Win version.
https://github.com/StrandedAlien/Blender-ArmorPaintLiveLink4LINUX
EDIT: Got a comment from PiloeGAO concerning differences between the paid and the self-compiled version of Armor Paint (which IMHO should not exist in FOSS). He closed the issue as invalid so i renounced to ask what diff´s he meant. See here: https://github.com/PiloeGAO/Blender-ArmorPaintLiveLink/issues/12#issuecomment-1028872503