Inventor 2011 software downloaded successfully from Autodesk but cannot activate. When I start application the first thing that pops up is that my 30 day free trial has expired and when I click on "activate" the next screen is completely blank so I cannot even start to activate. Apparently I must have another version of Inventor on my computer. I uninstalled all previous versions but evidently my computer still has traces of the old software conflicting with the new version. What to do?
Can I download all over again to another computer?