: Carefully type in your activation key. Make sure there are no typos.
A "proper paper" or official guide on a typically focuses on the legal acquisition and technical registration of the software. Because Guitar Pro 6 is a legacy version (having been succeeded by versions 7 and 8), official support and activation methods are centered on existing owners. Legal Acquisition and Retrieval guitar pro 6 activation key
Understanding Guitar Pro 6 Activation: A Complete Guide to Legacy Licenses : Carefully type in your activation key
: If possible, activate your copy online directly through the software. This is usually the easiest method. Because Guitar Pro 6 is a legacy version
The short answer is . Arobas Music, the developer of Guitar Pro, officially discontinued sales for version 6 several years ago. Licenses for Guitar Pro 6 are no longer available for purchase