Alright I got it fixed.
to put everything simply: the original model from the initial release from sfm was just chillin in my addons folder causing my game to not recognise the new version

Sorry for interrupting your "retirement" everything's fine now.
Have a good day.

I'll redownload the addon to see if that fixes it

Uhh, I think you have the wrong model. The hair and legs should be different. Did you download the updated version?