Hi,
In recent versions, for the 3ds Max 2022 and above, our plug-ins are now installed at C:\ProgramData\Autodesk\ApplicationPlugins, using the latest package format for plugins and there's no need to specify /MAXVER & /MAXDIR parameters - these parameters have been "replaced" by the /APPPLUGINSDIR parameter (most usually, it's not needed to specify the "/APPPLUGINSDIR" folder).
I hope that helps.
Best regards,