Welcome to the forums, Louie123.
Check that TS12 is allowed through your firewall as that will prevent it from downloading properly.
When you say registered, you did enter in the serial number in your My Trainz account (aka Planet Auran account)?
I notice here that TS12 doesn't appear in your station route-list as it does with mine. I suggest contacting the helpdesk as they can assist you with that if you have entered in the serial number, as there have been some server issues.
John