Downloaded from mirror this time - same issue.
It appears to be running in the background. But no GUI coming up.
Have you let it run for a bit? It may be updating the chain but not thrown the splash screen up. I've had other coin clients do that occasionally.
We're pretty sure the download is fine, we haven't changed anything.
Cheers
Skunky
ethought: how about your wallet, as far as I know, wallet ran in the background for a while typical for win8, then GUI comes to the front. Solved?