Once Guitar Pro 8 installed, you need to activate it with your Guitar Pro 8 license number.
Please make sure to use your Guitar Pro 8 license, and not the license of a former Guitar Pro version (7.6/6/5/…). Otherwise you won't be able to activate Guitar Pro 8.
The Guitar Pro 8 license is composed of 3 sequences of 8 characters (numbers and letters), and always start with the 8 digit looking like this:
If necessary you can order a Guitar Pro 8 license from this page.
Enter your license number in the activation window as shown below, then select Activate.
Guitar Pro 8 is now successfully activated!