Hi Joe H,
Whatever Yamaha say on their download page for YEM, I have Version 2.8.1 installed and running on my Windows 7 (Home Premium SP1, 64 bit) laptop.
I don't actually use it to produce install files for my Genos, (I have a Windows 10 laptop that I use for that), but on the Win 7 machine, the program seems to run without generating errors.
I have an info file for an SX900 and the program makes installation files for this model without generating errors, although I don't have an SX900 to try to install the resulting file.
I don't have an info file for an SX600 so I can't even try to make an install file for that model.
Have you actually tried version 2.7 or later on your machine?
Regards
Ian