Need to be flying 747

Ok so here it is. Purchased PMDG 747 Yesterday off the web site - was keen to get it going so downloaded there and then, upon validation the setup box just dissapears, I sent an e-mail to support who said it was a firewall problem, however have double, triple and quadtriple checked all are of while trying to validate, have seen a few posts on this topic in the forum but no real answer.Has anyone else had the issue and had it resolved?Cheers