Stuck on Splash Screen 2

Ok, so I made the mistake and posted about a banned Repo (TVAddons). It hit me too late that this is not an official build. I never thought of that. So my apologies on that. Nevertheless, as I have now started a CLEAN install, without any add ons etc, I still can’t shake this Repo. Any ideas how to do this? It works fine on my Mac, just not on my Mac Mini. I am still stuck at that splash screen. Again, I am not trying to get support on an unofficial build, I am trying to get rid of it and I can’t.