Install Button 5.6 does nothing

After working over 5 years with Unreal, I can not use it anymore, it simply won’t install.

I uninstalled every version I had, every trace of Unreal/Epic, hoping to get a restart.

I just upgraded from win 10 to win 11 and it still does not work.

Sorry for all caps, but I NEED HELP URGENTLY!

Thanx