The PG DX plugins work in Reaper v7.
You should be able to run both version if you install the latest as a portable.
Just backup your Reaper resource folder. You should be able to copy it to the portable install folder so you have the same settings/plugins in the new version.

https://forum.cockos.com/showthread.php?t=230721
https://forums.cockos.com/showthread.php?p=414233