Do you still have the serial number for 13.1? If so, there can be plenty of help here for getting it installed. To start, you can download the installation file from here: Download Adobe Premiere Elements 14, 13, 12, 11, 10
You can install 13 along side of 14 on the same computer. They won't conflict. You can open the old projects on the older software and build new projects on the newer software.
You are correct, new versions don't open projects from old versions. You are also correct that there is little telephone support. Adobe, like other companies, can't provide teams of employees in cubicles that have $100 per hour skills to solve problems for software that provides half that in revenue.
We apologize for the inconvenience caused. Can you please share the issue that you might be facing when uninstalling PRE 13? Also, what are the issues being caused when opening older version files?
As per the above recommendation, I have now also re-installed the old 13 version and subsequently the 13.1 version. That has allowed me to open the older projects after a few tries.
I have not yet worked with the new 14 program but hope that it will function as well as the previous 13 version.
I appreciate your follow-up.