I have downloaded the latest ME 9.10 upgrade. I also downloaded the latest PolyStyle install, apparently version 3.1c.
I unzipped the PS file to c:\program files\multi-edit 9.10\polystyle.
In ME, I went to Tools –> Install Add-on Packages. In the browser, I navigated to c:\program files\multi-edit 9.10\polystyle\addons, and the magical install lst was found. I completed the install.
When I open Tools –> Config Code Formatter, it shows that I am still running version 2.0z of PS.
Obviously I missed something along the way. Was I supposed to unzip to the addons folder, rather than the polystyle folder. Do I need to uninstall the original polystyle by deleteing folders or items someplace.