If you want to upgrade to GPO4 from an earlier version you will be prompted for a valid GPO Kontakt serial number.

Your GPO Kontakt serial number can be found in the DVD case, or in the info screen of the Kontakt Player, or in your account at the Native Instruments Service Center (which you can access online).

Once you have your Kontakt serial number, enter all 25 digits with the dashes between each set of 5.

If you are still having problems or the system is not accepting your serial number, contact us directly at support (at) garritan.biz.

Please do not post your serial number on the forum or ask for specific help. Each serial is specific and unique to each user so you must contact us directly.

We will confirm the right number is in our database and help get you going as quickly as possible.

Best regards,