Hi Hugh,
I don't know if you're aware, as of 1st July, 2021 Yamaha have made all Tyros and Genos expansion packs free. Simply go online, download the Yamaha Expansion Manager, and install. I've just obtained ones that would have cost me £350 last month .. all free.
Regards
J
Visit the Yamaha website below ...
Do a right-click to open this up in a New Tab.
https://uk.yamaha.com/en/products/contents/keyboards/vse/index.html
... and select your instrument from the drop-down box on the left.
(Not sure if doing this actually does anything!)
Select the pack that you want (Eg. Best of Europe) and you see this:
... and at the bottom it says:
New Voices and Styles packs are being delivered as encrypted data. You must use Yamaha Expansion Manager (YEM) to create a pack install file to load this pack into your instrument.
Please refer to this link for additional instructions >
This is where clicking on that LINK takes you .. to the Yamaha Expansion Manager Owner's Manual.
https://uk.yamaha.com/files/download/other_assets/2/1396982/yamaha_expansion_manager_en_om_v280_k0.pdf
And below that is the list of keyboards, so you have to click on the one for your instrument.
I have a Tyros 4, which is not involved in all this. If you have one of the instruments mentioned and give it a go, can you do a Reply to this and let us know how you get on?
Hugh
PS. This is where you can download the latest version of Yamaha Expansion Manager (they say you must remove any older versions of this program you may have before installing this new one).
https://europe.yamaha.com/en/support/updates/yem_win.html
... and the actual download appears right at the very bottom of the page .. so scroll down to the bottom until you see this to click on: