I downloaded the Ableton Live 10 manual and resolved the issue.

Ableton Live looks for VST plug-ins in the /Library/Audio/Plug-Ins/VST folder. The library location stated in the PG Music support page on Ableton Live is incorrect

You have to turn on Live’s use of these plug-ins on or off with the Use VST plug-ins in System Folders option in Preferences>Plug-ins