VST - Omnisphere

Hi I’ve just reloaded W10/CB11 etc to new SSD’s. I have installed Omnisphere but cant add it to the VST list? Help please! TIA


What exactly does it mean? Is it VST2 or VST3 plug-in? Is there path set in Plug-in Manager, to the plug-in? Is the plug-in Blocklisted, by any chance?