Cubase 8.5 transit vst not working

Sorry I don’t get you either.
When you start VST Transit, a page should appear “Log in to VST Transit”. The top field is “MySteinberg E-Mail”, right? You can enter a @ charcater there, all else would be very strange.
Then after you logged in there, and given that you have not done so yet, you will be led to a second page where you are asked to provide a user Name for VST Transit.
Did VST Transit succeed to ever download a new version? It should, and you should not cancel this (if that is possible at all). Click on the bottom right “VST Transit” text and an about box should come up. On the bottom, the version number is displayed. What does it say?
I find it particularily confusing that you say “it keeps downloading”, do you mean it attempts to download every time? If so, does it not succeed to do so? That might explain a lot, but then the question is if you messed around with the installation or why your system prevents the download to succeed because of whatever reasons. I guess there should be a message then?