Installed Fences 4 without uninstalling Fences 3
 
No Fences 4 is requesting a new license, and when I go to uninstall F4 is fails with the following.
 
C:\Program Files (x86)\Stardock\Fences\SdAppServices_x64.dll
In use and cannot be deleted.
 
Please advise if this can be ignored.
 
Cheers