gullplague@gmail.com Yeah I think this method is not working on older keyboards. I suspect there is a more older file transfer method that Musicsoft Downloader is using but I haven't looked into it yet.
If you want to help investigate the problem can try installing Yamaha's "Midi song to style" program and try creating some style from midi there (doesn't matter what) and then try using its "transfer style to keyboard" functionality, see if it transfers the style over the wire. If it doesn't work it will confirm this method is not working on older keyboards, and if it does there is a hope I can replicate it (I would need to get the logs to investigate how it works, I can show how to obtain them if anyone is willing to help).
Thank you.