That's good to hear.
Thanks for the compliment, but I'm not a dev, just an advanced user, and it's v3.4, not v3.4.7, the 7 is part of the file extension of the 7-Zip archive.
Version 3.4
Suppression de 7za, le script utilise 7-Zip, vous devez donc avoir 7-Zip installé.
Plus besoin d'extraire les thèmes, le script s'en charge.
Mise à jour du module SFX en version 1.70.3900.
Version 3.4
Removed 7za, now the script will use installed 7zip instead (you must have 7Zip installed).
No need to extract the themes anymore, the script will take care of it.
Updated 7zsd.sfx to 1.70.3900.
Rar Unlocker is only needed if the archive is locked. You can launch it, it have a GUI.
I don't know what is the problem with your Windows install, maybe you should try to install a version without any modifications.
You can also try to run the maker in a virtual machine if you're familiar with.