The author of this program: AsteriskAmpersand
This simple program allows you to transfer the saving of another person to your Steam account. (Also from pirate to Steam)
Brief instructions: (complete in the archive)
Find out your Steam ID 64
back up your save
Monster Hunter: World: SteamID Changer {AsteriskAmpersand} Free Download
(Path to save (License)
F: \ Program Files (x86) \ Steam \ userdata \ 119 ***** 4 \ 582010 \ remote \ SAVEDATA1000
run the save file through this program (drag the save icon to the program shortcut)
