Hi Vali,
those Packs are in CPF format. I have imported a PSR-SX900 Instrument Info file .(n27) to the YEM: The SX900 versions of these CPF Packs can be imported to YEM now but NOT the SX700 versions of the Packs.
And of course, the Packs can NOT be installed on other than the SX models. For Tyros5, Genos and Sx7x Install Targets, YEM says "This content cannot be installed on the selected instrument".
Best regards,
Chris