When I got my M61 I had installed old drivers and I couldn't install or even uninstall the drivers. I got the error: 1721, something about a program that could not be run or found.
The only way to uninstall it was to do it inside the Control Panel / System / Hardware and then to remove the installation of the Korg M50 / USB Korg midi drivers (or something like that). After that reinstalling by searching for the drivers.
Just for your info.
Error 1721 when installing USB midi driver
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Error 1721 when installing USB midi driver

Developer of the free PCG file managing application for most Korg workstations: PCG Tools, see https://www.kronoshaven.com/pcgtools/