Best bet is to send an email to Andy at Ultimarc.
Yep, do that. Find your version number before mailing him.
Click "Start", "Control Panel", "System", "Hardware", "Device Manager" and right-click on the "HID Keyboard Device".
Click "Properties", "Details", then in the drop-down select "Hardware IDs". The version follows "Rev" in the displayed string., for example "Rev_0026" is version 26.
Then drop him an email.
I assume he doesn't want to make it publicly available due to reverse engineering or the fact that old versions of firmware may be floating around.