The user ID and key ID for Guitar Pro 5 are supplied by the vendor. After an online purchase, the vendor should send them to the user, typically via e-mail.
Users who have forgotten or no longer have access to them can recover them from the Guitar Pro website if the software was bought from that site or registered in the customer area. If it was bought from a third party and not registered, the Guitar Pro website will not be able to track the user ID and key ID. In that case, users need to contact the third party's customer service department.