Yamaha XGPlayer 4.0.1.52 Update for S-YXG100 Plus/PVL 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-V40152-Update-SYXG100V1.zip file
onto the \Yamaha\SYXG100\ or the \Program Files\Yamaha\SYXG100\ folder.
Overwrite the existing files with the new ones as needed to perform the update.
Then reload the Yamaha XGPlayer program.