You can download new data for the Ramzzess Boeing 777 from the Navigraph web site. Navigraph supplies FMS data and aeronautical charts for aircraft simulations only. They are not for real world aviation! Scroll down the page until you come to this entry:
They offer several different subscriptions.
They recommend backing up before installing the updates. My computer is still backing up so I haven’t installed them yet. There is no exe installer as the instructions seem to imply. I’m just going to merge the files into the “777 Worldliner Professional” folder.