Had an issue upgrading my dev environment. When I ran the nintex.install.exe to upgrade our installation from version 220.127.116.11 to version 18.104.22.168 and we tried to install (to test) nintex live for the first time, we kept getting error The term ‘powershell’ is not recognized as the name of a cmdlet, function.. etc.. then it would crash..
and when I clicked on nintex live in central admin, I would see:
I opened a ticket with Nintex support and the person sent me the installation manual and then link to upgrade steps. None of which really helped.
After troubleshooting my own problem, I finally figured out that the reason why the install was failing. When I went into CMD and typed in powershell.. It gave me an error. So I added the location to powershell.exe in the windows path (in our case it was C:\Windows\System32\WindowsPowerShell\v1.0) and re-ran the installation EXE and then it worked without issues.
Hope this helps somebody.