You can try to activate your software online.
If this does not work please send me a PM (click on t_gaisf profile name and then Send this User a Private Message) with your Serial Number, the request code and confirm the registered company name
or contact our licence assistance team for direct support.
When you tried to run the trial, is the "Try" or "Run" button already grayed out? Usually when you still have days left on the trial and for some reason you needed to reinstall it, the remaining days on the trial will be gone. In this case, I would suggest for you to try to do a clean uninstall and do a new install of the trial to check if it reinstates the 30-day trial period. You can check this link for instructions on how to do a clean uninstall of an Autodesk program on your machine.
Hope this helps!
I am having the same problem. The suggested solutions in the existing replies did not help, mainly because there is no serial number for the trial version. I just want to test Inventor 2014 for 30 days.
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