Dorico Elements 3.5 and missing VST plugins

I see several VST plugins in the ‘allowed’ list which I was previously able to use in 3.0 which no longer appear in the pull down list when assigning instruments for playback. Kontakt player is one example.
Does anyone know what might be causing this?

Thank you.

Please do Help > Create Diagnostics Report and post the corresponding zip file here. Thanks