If you have the GSX menu under the "Addons" menu, this means that everything's working correctly on our side, and your only problem, is that you upgraded to P3D 3.2 using only the "Client" installer.
This is a known problem of the P3D Client installer and it doesn't affect just GSX, but *every* 3rd party application that use a menu. It's fixed by installing either the "Content" or the "Full" P3D installer.
If, instead, you DO NOT have the GSX menu under the "Addons" folder, than it's an entirely different issue, and it's likely caused by the antivirus, blocking our software from starting.