I installed it about a week ago....it worked perfectly in Win 8 in
both X2 and Cubase...loved it...but didn't buy it and uninstalled
When I saw this thread I reinstalled it, since my demo license is still good...
worked perfectly again...
Don't know why you wouldn't get the GUI unless you haven't installed the Demo License..
in which case it would only be blurred, not gone...
Maybe it's your Graphics drivers that it has an issue with..don't know...
but it worked fine for me..