I made a video on the trial version of premiere elements 12 and you get that strip across the video that says its a trial version or whatever. I got the full version and when I open the existing video that I created with the trial version the strip is still there while opened in the full version that I just purchased. How do I fix this problem?
What computer operating system is your Premiere Elements 12 running on? Be sure to update from 12 to 12.1 via a project's Help Menu/Update. Just background notes.
Now to the issue that you present...
You should be able to open the project file (project.prel) from the tryout in the purchased version, then
Delete Rendered Files
in order to remove the Adobe watermark from that project file.
Be advised that you cannot remove the Adobe watermark from an export from the tryout project, be it the export of the Timeline to a file saved
to the computer hard drive or a burn to disc product.
Many of us have found that opening the tryout project file in a purchased version automatically removes the Adobe watermark. However, this
does not happen in all cases.
Please let us know the outcome.