Hi Henry,
Yamaha Expansion Manager is the program you need on your pc to manage your expansion packs.
Here is the version for Mac users:
Yamaha Expansion Manager V2.5.2 for Mac OS X 10.11 - macOS 10.13https://europe.yamaha.com/en/support/updates/yem_mac.htmlSystem Requirements
- OS: Mac OS X 10.11.x / macOS 10.12.x / macOS 10.13.x
* Correct operation cannot be guaranteed with Windows® installed on a Macintosh® computer using the Boot Camp utility.
- CPU: Intel® Core 2 Duo or better
- RAM: 1 GB or more
- Hard Disk: At least 500 MB of free space (Additional space is required for storing Pack data.)
- Display: Resolution of 1,280 x 800 or better, full color (32-bit)
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For Windows users
Yamaha Expansion Manager V2.5.2 for Windows 10/8.1/7 SP1System Requirements
- OS: Windows® 7 Service Pack 1 (32-bit, 64-bit) / Windows® 8.1 (32-bit, 64-bit) / Windows® 10 (32-bit, 64-bit)
* The executable file comes in a 32-bit version only but has been confirmed to operate normally with 64-bit operating systems.
* Correct operation cannot be guaranteed with Windows® installed on a Macintosh® computer using the Boot Camp utility.
https://europe.yamaha.com/en/support/updates/yem_win.html