I downloaded the trial until my full version arrives and it says "you must activate your product before you can use it." But its a trial, so I clicked activate and typed in 000-00000000 because thats the trial serial, and it asked for an activation code I went online logged in @ autodesk.com and it asked for my serial so I typed again (000-00000000) and it said that is an invalid serial. Please some one help, pm me