Create your folder structure in %LocalAppData%l\Kemper Amps\RigManager\Local Librarywhile RM is NOT running.
When you start Rigmanager you will see the new folders.
After that you have to import the rigs manually into the folder structure.
I'm using rsync on Mac but you can any other program to create folder structure. I think rsync is also available for Windows.
This is my example on MAC copying the the Folder Structure from my dropbox to the "~/Library/Application Support/Kemper Amps/RigManager/Local Library/Tone-Junky" RigManager destination on MAC.
rsync -av -f"+ */" -f"- *" ~/Dropbox/_Kemper/PACK-PAYED/ToneJunkie_Everything\ Pack/ ~/Library/Application\ Support/Kemper\ Amps/RigManager/Local\ Library/Tone-Junky
rsync -av -f"+ */" -f"- *" ~/Dropbox/_Kemper/PACK-PAYED/ToneJunkie_Everything\ Pack/_IR_PACK ~/Library/Application\ Support/Kemper\ Amps/RigManager/Prst/Local\ Library/Cab/Tone-Junky
In Windows 10 the path is:
Again this way you just create the folder structure, the content has to be copied separately