The Motif 8 (2001) qualifies for the "Legacy Yamaha Synths" Forum.

None or very little of what is discussed in this thread applies to the Motif 8 Editors. There is no "Standalone" Editor.

Back then there was just a Voice Editor Motif6/Motif7/Motif8.
I will need to do some research to find out if they can run on a Windows 10 computer... the software was originally done for Windows 98/ME/2000 (yikes!) Good luck there.

The problem with hardware synths and software is the hardware synth outlives the software and the computers that can run said software, by more than a decade.

Im not sure I have any way to test this... sorry.