I used an older computer to run the flash and had to switch USB slots a few times until I found one that worked. I also had to install the Posh-SSH module manually.
Worked great in the end. All the games are installed and the Williams games are much improved.
I have both the Williams and the Star Wars cabinets. No need for 2 anymore. I'm going to flash the Star Wars cabinet tomorrow. I have it listed on CL already, but maybe the updated games list will move it faster.