Installation and Error 502

Hi Everyone, It is nice to meet all of you. I am quite new. I installed the script onto a clean Debian system but now I receive an error 502 when I try to go to the panel.

I did send a request for an installer of £5 but not heard yet.

I look forward to hearing from you thanks clinton

Ok I now have figured out it has to do with Plesk, but what I would like is to run Plesk with QuickBox at the same time. I have some ideas, do I create another user and install it in that directory although I was certain that it has to be installed on root. Or do I install quickbox first then install plesk? hmmmm