On more recent versions of Kontakt (i.e. Kontakt 5+), and more recent versions of Mac OS X (i.e. Yosemite), you may encounter an issue where upon adding the VDL Library to Kontakt, you receive one (or both) of the following error messages:

 

rror while writing files to disk. Adding the library has failed

“Error while writing files to disk. Adding the library has failed.”

 

Virtual Drumline 2.5 can not be activated. Please run the original installer of the library

“Virtual Drumline 2.5 can not be activated. Please run the original installer of the library”

 

If you encounter one or both of these errors, it’s likely just a bug in how Kontakt has logged your library addition, and you can workaround these errors by doing the following steps.

 

  1. Quit Kontakt.
  2. Quit Sibelius, Finale, or any other host programs that may be running Kontakt.
  3. Launch Service Center. If you see the option to activate your library there, go ahead and do so (you’ll need to create a Native Instruments account if you don’t already have one). Service Center may be downloaded for free from Native Instruments.
  4. Once you’ve successfully activated there, relaunch Kontakt and verify that your library appears in the Kontakt browser and is functioning as expected.