I think the issues he had were related to making things work on a MAC before using the tools. Something about changing his shell to Bash, etc.
Your instructions were immensely helpful! THANK YOU. At first it did not work. I installed the software using the Windows installer that installs node.js, the dfu-utility and the particle-cli. Unfortunately, that did not quite work out well. The driver kept coming up asking if I wanted to install the driver software. I kept hitting install. But then it would just come back again. Eventually, I said no and it stopped.
Basically, when I would enter "particle update" it would just say it couldn't find any Photons in DFU mode. Eventually, I figured out this was probably because the drivers weren't installed correctly and the device manager wasn't happy with the "photon in DFU mode" it found.
I also noticed that I had a really old version of node.js on my PC. At this point I just punted and uninstalled node.js, the particle CLI and everything I could find related to particle. Then I ran the Windows installer again.
This time the driver popup only came up two or three times and I committed to just hitting "install" every time no matter how many times it asked me.
This time everything seemed to install fine and the "particle update" command was able to see my Photon in DFU mode and try an update.
But, once again, there was an error. The error said something about an "invalid DFU suffix signature". I remembered seeing something about this message somewhere on the forums and that it was a false error and it should be okay to ignore it.
I repeated the update with my second Photon and got the same error. But when I tried to access them using the mobile app, the Tinker link seemed to be working. I tried it and BANG! the Photon responded to me changing the D7 pin as it should!
The other Photon also responds to Tinker and I was able to flash both of them with the blink example from the IDE.
So I AM HAPPY!
I want to thank every one on these forums for all their help. Particularly fvera, bko and scruffR who responded to me so graciously.
Thank you all very much.