Does it require its serial number entered in Help>About Installed plug-ins, and then DS restarted? The serial number should be available via right-click on the product in DIM (if it's connected, I think) or from the serial numbers page of your account.
Yep, it's not in my serial numbers list here. I've noticed the full Headshop 11 stopped being available in the shop about half an hour after my initial message so maybe there is a problem with it? The upgrade is the only product still for sale at the moment as far as I can see.
I did thank you it took quite a long time to show, maybe a wee not to buyers saying the serial number may take some time. I had to go out some I'm not sure how long but it was longer than 15 - 20 min's this I do know 2b1af7f3a8