I dont think there is compatability between PPro and Elements
If this does not work you are out of luck. Projects probably too old,
Import a Premiere Elements project (Windows only)
- Select File > Open Project.
- Browse to an Adobe Premiere Elements project file, with file extension PREL.
- Click Open.
Premiere Pro converts the Premiere Elements project file to a Premiere Pro project file.
I am having the same problem.
I have opened a .prel file in Premiere Pro, it shows all of the media files from the Elements project but the timeline is not imported.
I have tried to copy the layout file across but that doesn't work. I have also tried to import the project or sequence and it does not show the files as supported.
I have the media, I just do not know how to import the timeline/sequence.
You cannot import Elements 13 only previous versions.