what i wound up doing was this:
navigate in windows explorer to C:\Program Files (x86)\XLN Audio\Addictive Drums
cut the folder "Sound Data"
make a folder in my sample location called "Addictive Drums"
open that folder and paste the Sound Data folder into it
open a command prompt in administrator mode
go to the "C:\Program Files (x86)\XLN Audio\Addictive Drums" folder
type mklink /d "Sound Data" "<mysamplepath>/Addictive Drums/Sound Data"
this creates a symbolic link to the moved sound data folder so windows "thinks" it's still in the same place
this is by far the easiest way to move directories and requires no registry edits.
HTH,