I'm assuming you're looking for a valid user ID and key ID for Guitar Pro 6. However, I must inform you that:
For versions prior to Guitar Pro 7, a full license consists of two distinct alphanumeric strings: Guitar Pro 6 User Id And Key Id
What are User ID and Key ID?
Both identifiers are required to validate the software. Leaving one blank or failing to enter both correctly will result in a failed activation. How to Retrieve Your Lost IDs I'm assuming you're looking for a valid user
Arobas Music still provides support for legacy products. Here’s what to do: Your full name used at purchase
Once you have your IDs, follow these steps to activate the software: GP6 - Guitar Pro 6 offline activation – Support
If you never purchased GP6 and want a legal ID, you might find it difficult to buy directly, as the company has moved on to Guitar Pro 8. However, there are two paths: