Hello Macabee,The firmware updater is available for Windows platform. There is no Mac version now. However, it is possible to use Window's emulator on Mac to install the firmware updater. Maybe the Mac expect can help. Thank you.
Many thanks raychan. I have just received my RF60 this morning, I checked the firmware, which is up to date [1.24] I am very impressed with the build quality and overall ergonomics. It certainly beats the Metz that I had recently bought and returned as being quite shoddy in construction.
A happy and satisfied photographer!