Where on my computer is Reason looking for VST plugins?

By default, Reason 9.5/10 and Reason Essentials 9.5/10 look for installed VST (2.4, 64-bit) plugins in the following locations:

Under Windows:

C:\Program Files\VSTplugins

C:\Program Files\Steinberg\VSTplugins

C:\Program Files\Common Files\Steinberg\VST2

Under Mac OS:

Library/Audio/Plug-ins/VST

~/Library/Audio/Plug-ins/VST

It’s also possible to add your own custom locations to the “search list” if you like. You can do that on the Advanced tab in Preferences.