Thank you ynotfish and Playsound for your swift replies.
Ynotfish I understand the methodology of opening each individual transition from a project created in Pdr13 and opened in Pdr14. It works. But it's slow and takes time when you have many, like into the dozens or hundreds

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Playsound has offered a more efficient method of copy/pasting the contents of the folders contained within the folder 'Mytrans' in Pdr13 to the same folder in Pdr14. It is faster or seems faster until you realize the folders in both versions have the same names.
FROM (C:\Users\YOURNAME\Documents\Cyberlink\PowerDirector\13.0\MyTrans\Transition_000, Transition_001, etc.)
TO (C:\Users\YOURNAME\Documents\Cyberlink\PowerDirector\14.0\MyTrans\Transition_000, Transition_001, etc.)
At least that's the address's on my computer using Windows 10. Both solutions have their drawbacks. Especially when you have many previously created transitions in both versions of Pdr.
You can't overwrite as you lose one of the sets of folders and the created transitions within. Of course if you do it before creating any new transitions in your new Pdr14 then you're all set. Which wasn't mentioned in the installation process/instructions. So if you already have dozens of transitions in each version you have a problem... I only realized the problem when I went back to an old project to update it.
Why doesn't the installation method for Pdr14 do the same with the 'Mytrans' folder as it does with all the others? My new Pdr14 has all the downloaded 'particle' and 'pip' folders (from Pdr13) and all the particles and pips are there for my use in Pdr 14. I don't have to re-download them all again, and since that runs into the hundreds it saves so much time and effort. Why not do the same for the 'Mytrans' transitions?
Oh well, I guess that's a renaming one by one process (either the transitions or the folders) I'll have to go do

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Unless, any other solutions?