I spent some time this past week with Steve Wilson and his AnyCubic delta printer, helping him install his ATX PSU, ATXPiHat Zero and Octoprint.
He was having some issues with getting the ATXPiHat plugin installed. Long story short, there was an issue with pip in the Octoprint virtual environment that breaks some of the older pip install scripts. After spending 4 hours at his place an another 4 hours today, I have updated the installation instructions to account for the issue.
Thanks Steve for the help!