Per the install, I installed the beta version of the Gizmo plug-in and confirmed the following folder in the plugins folder:
Gizmo64.plugin
In the win_x64 folder of this folder, I have the following files:
Gizmo64plugin.xpl
libcurl.dll
OpenAL32.dll
Should Gizmo show up in the plugins section of X-Plane? I don't see it there ...
I'll try re-installing using the stable release version.
P.S. By the way, this is X-Plane 10.51.