I already have a version of SOLIDWORKS downloaded on to my desk top with a serial number from a previous 3 month subscription that has now expired and I can't seem to get to the option menu that allows me to put a new serial number in. It just keeps popping up with a message that says my serial number is expired, which I know, but won't give me any option to put in a new serial number. How do I put in a new serial number for another subscription, I had the professional version for 3 months and now I signed up with the student educational subscription.