If you want to move your library just follow those steps :
- copy all the Spark Library folder witch is located here :
* PC : C:\Users\*user's name*\Documents\Spark Library
* MAC : ~Library/Arturia/Spark/Spark Library - Paste this folder in his new location
- open Spark in standalone go to "pref" and change your library path. Browse and select your new library folder
- restart Spark standalone