I downloaded the new OT player along with a free library called Layers.
The installation placed the .vst in /Library/Audio/Plug-ins/VST and I also copied it into VST2.
I also included “Sine Player” vst2whitelist.txt (along with VSL’s Synchron Piano Player).
The Synchron Piano Player is present in Dorico’s VST list; Sine Player is not.
PS Logic Pro & Cubase can use SINE Player. Logic Pro uses OT’s provided AU but I am not sure whether Cubase uses the AU or a VST that Dorico cannot.