Peter, I don't know what you got but I ended up with a 10MB OS upgrade file which includes upgrades to all the G-70 styles. Getting there is a little convoluted with the Roland system, you have to keep loading browser pages till it eventually gets you to the download.
Regretably I do not have a G-70 so I have been unable to activate it. But in a couple of years saving .......!!
Regards
Keith