For some years ago I decided to learn and build me a CNC machine, but there was no time  for it. Until for some weeks ago I opened the boxes with all the goodies, including the G100.
I had to play around with the PC and G100 before they was willing to talk together. It was then I discovered I need the firmware.

My question is, where do I find the latest firmware for G100 / G-rex?

I did find the firmware in the Yahoo Groups Geckodrive under files.