Have you tried the deep rescan that I suggested in my last response? This is not that same as simply clicking rescan in Ableton, the deep scan fixes this issue in many cases:
Live 9 and below:
Go to Preferences->File Folder and Option/Alt-click “Rescan Plug-ins” to force a deep rescan.
Go to Preferences->Plug-ins and Option/Alt-click “Rescan” to force a deep rescan.