Sorry for the language, didn't notice the rules, shame on me!
Yeah sorry, I was going to reply. Installation via Steam Workshop didn't work at all. So I searched on how to install mods and Addons the old-fashioned way. After a few hours (aproximately ^^), I figured how to find R3F addons, install them (They put too many folders and subfolders in the package ^^ @R3F_UNITES_3.6/@R3F_UNITES ) and the laucnh parameters to enter in A3Launcher...
Now it seems to work! Thanks again for your amazing work.
Sorry for the inconvenience. I have hesitated a lot before asking for help but YOLO! :D