Yamaha XGPlayer 2.0.0.46 Update for S-YG20 version 3.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-SYG20V3.zip file
onto the \Yamaha\SYG20\ or the \Program Files\Yamaha\SYG20\ folder.
Overwrite the existing files with the new ones as needed to perform the update.
Then reload the Yamaha XGPlayer program.