Here we go.
Easily repaired problem in the installer that the developer has not seen appropriate to do or to mention it in the install instructions.
Perhaps a bit too enraged customer tries to get into developer's forums just to read the posts - not even wanting to bother anybody as the forum most certainly has a topic about this already. Reading it would have been enough. Instead more problems arise, change your web browser, do this and that. Yet the answer was really straightforward, just add a new user to your pc.
And now I'm called a criminal.
Happy Easter