I have a new Eisy and looking to migrate from a polisy with PG3x using the hue and ring plugins.  I’ve been scouring the threads and everything I’m running across is that you can’t go from polisy PG3x to Eisy PG3x (just pg3 to PG3x) and it Seems as if you have to reinstall plugins, etc.  My concern is I have many scenes and programs using hue nodes (bulbs) in IoX and losing all the nodes in my scenes and programs upon migration and having to redo all of those.  Many of the threads regarding this are old and mentioned a future fix to go from PG3x to PG3x.  Does anyone know if this is the case?  Will I have to reconstruct all of my hue and/or ring nodes in scenes and programs in IoX?  Thanks in advance!

Make a Polyglot back up from pg3x and after your migration, restore the back up.

However, some program manipulation may be required to adjust any changes to node names/addresses. Each program may need to be resaved after migration.

@jlamb be sure you make a text copy of all your programs! Right click the root folder in Programs tab and select "Copy Folder to Clipboard" (Make sure you use the COPY option and not export!). Paste that to a plain text editor (not a word processing program). Save that file so you now have a text version of all your programs and can recreate them should things go crazy due to the change in the plugins. 

In addition to what @DennisC suggests if you use Network Resources they will likely need to be resaved as well.