Go to the Preferences (under the Edit menu on a PC) and, on the Media page, select Clear Media Cache.
You want to delete the preview (rendered files) files not the conformed audio or video files.
Open your tryout project file in the purchased Premiere Elements 14 and then in the Expert workspace go to Timeline Menu/Delete Rendered Files and click on that. Then render the Timeline content. Have you been there and done that?
You cannot remove the Adobe watermark from an export from the tryout even after purchase, be it an export to file saved to the computer hard drive or a burn to disc product.
It is important for you to make the distinction between whether your goal is to remove the Adobe watermark from an export of the tryout or the project file of the tryout.
Some just in case miscellaneous....
1. Edit Menu/Preferences/Media and its Media Cache Database is the route to clear conformed video files. That is not involved.
2. If you have Windows and are using Premiere Elements defaults....Document\Adobe\Premiere Elements\14.0 takes to your to
a. Adobe Premiere Elements Previews Files Folder - where the preview files are saved to. That is where you want to be to assure that the opened project's Timeline Menu/Delete Rendered Files did the job.
b. Media Cache Files Folder - where conformed audio files are saved to. You do not want that.
(If Media Cache Files Folder is not at this location, then check Edit Menu/Preference/Scratch Disks and the Media Cache category to find out where it is)
For more information of preview files and removing Adobe watermark, please consider
Thank you Steve
Thank you A.T Romano. I deleted the rendered files and that worked just fine.
Thanks for the follow up. Great news that the Timeline/Delete Rendered Files worked for you in removing the Adobe watermark from the tryout project file. Great job.
Please do not hesitate to ask if questions or need clarification on your Premiere Elements workflows including Timeline rendering
and the nature of the preview (rendered) files that are automatically produced by the program during Timeline rendering.