"mkdir not found" usually occurs because the vCenter appliance shell was not set to bash, and was still on appliancesh
Being unable to ssh back into the vCenter appliance is usually because the "chsh" command did not succeed correctly.
Do you still have the terminal output?
I couldn't get this to work. I followed the instructions but just get asked to put in my password every time it tries to run a command and the command such as mkdir then fails
I switched the shell back to the appliance shell but now I can't SSH back into the vCenter Server, putty just quits on me.