Yamaha XGPlayer 2.0.0.46 Update for S-YXG70 version 1.x:

Note - Be sure to close the Yamaha XG Player program before installing the
       updated XG Player files.

Extract all the files from the Yamaha-XGplayer-V20046-Update-SYXG70V1.zip file
onto the \Yamaha\SYXG70\ or the \Program Files\Yamaha\SYXG70\ folder.
Overwrite the existing files with the new ones as needed to perform the update.
Then reload the Yamaha XGPlayer program.