From the mySongBook website:
All of the scores you bought remain available from the "My Tabs" area of the mySongBook website.
From Guitar Pro 7.5:
Connect to your mySongBook account from the Guitar Pro 7.5 welcome page and retrieve your purchased tabs from the mySongBook entry.
Note that you can also browse your mySongBook tabs from the File > Browse menu in Guitar Pro 7.5.
From the Guitar Pro mobile application:
- Open the Guitar Pro Mobile application
- Select the Locations icon from the bottom of your screen
- Connect to your mySongBook account
You can now access your favorites and purchased tabs, they will be listed from this window.