It seems that you are using Premiere Elements 10. Please confirm.
You can just delete the Preview files and everything will be fine. Go to Sequence menu to delete render files.
Could you offer more details.
You are saying that at this late date you found a tryout of Premiere Elements 10 to try.
Then you wrote
I have now downloaded the full version but still have a banner across the movie stating it was created in the trial version.
What is version is this "full version" that you have downloaded and from where, was it a purchased download, and what version did you download - Premiere Elements 10 or the latest version Premiere Elements 13/13.1?
Typically the users asking this type of question are going from tryout version to a purchased version of the same version as the tryout and not tryout version to purchased version different than the tryout.
But, immediate questions would be:
After you opened the tryout project file in the purchased product, after the Adobe watermark did not disappear, did you try Timeline Menu/Delete Rendered Files? And, if that did not work, did you render the Timeline, save close the project, and then reopen it?
More on removal of the Adobe watermark from the tryout project file as it becomes necessary. There is more to the story than the classical approach to Timeline Menu/Delete Rendered Files to get rid of those Adobe watermarks. Please see my post 2 in the link that John has already posted
i bought adobe photoshop elements 13 and with it came a free trial of adobe premiere elements. i started the trial but it has text across my video that says "created with adobe premiere elements trial version". how do i get it off?!?!
Please ask if you need clarification on any of the above.
Add On...I recently wrote a blog post on Adobe watermark removal in Premiere Elements. It is long and detailed.
Depending on your progress and your schedule, you may want to review the contents
Vinay thanks. Worked a treat