i just bought the licence for adobe elements 12. But i used before the trial version to test it (so i had this line with something like "created with trial version..." i've a french version).
On the new projects it's now working fine, but when i open a project started with the trial version, the mark is still there.
is it possible to remove it without starting the project again?
You cannot remove the Adobe watermark from an export from the tryout, whether the export is a file saved to the computer hard drive or a disc from burn to disc. But, you can remove the Adobe watermark from the tryout project file (project.prel) when it is opened in the purchased product. After the tryout project file is opened in Premiere Elements, go to Timeline Menu/Delete Rendered Files and click on that. The Adobe watermark should be gone. Some of us, including myself, have found that the Adobe watermark disappears just by opening the tryout project file in the purchased product, no need for the Timeline Menu/Delete Rendered Files. But, go with whatever works for you.
Please let us know if that worked for you.