The developer does not offer free full licenses for older versions.
Disclaimer: This paper is for informational purposes and does not advocate for the unauthorized use of software. GP6 - Guitar Pro 6 offline activation – Support guitar pro 6 user id and key id free free
Guitar Pro 6 (released by Arobas Music) requires a unique license key (User ID + Key ID) to unlock the full version. When you search for a free one, you’ll find thousands of results. But here’s the truth: The developer does not offer free full licenses