Hi @UE_Seb.Tho ,
Thank you very much for keeping an eye.
Yeah, sure. In fact I have done TONS of combinations during TONS of hours. I have opened a related thread too: IMPOSSIBLE to package a plugin in 5.3.2? Please help!!
EDIT: because of a casuality, I have noticed the main problem was related to a plugin is automatically installed within a hardware piece: the plugin from 3Dconnexion, even if not enabled in the project. I have deleted it from the Engine/Plugins folder and even if I still can’t package plugins from the Editor (but I can in 5.2 and 5.4), I have been able to do it with a .bat file, at least.