How was it a billing account question when you already have my money? Can you give us a direct link to 11.55?
It's an 'account' question because you are asking why you are not seeing it there...
However, Start11 .55 (not 11.55) is indeed under your account:
We can't give out direct links as we are wanting to limit the trials that are allowed at this time - something the installer would allow access to.
Stardock Support Manager