this is quite late but i hope you see it
i had the same problem as you but its actually reallys simple to solve.Once youve deleted the pluginregistry.cfg and ticked VST: GSNAP wouldve been installed and i guess just like me you couldnt see it. All you have to do is scroll down in the effects section and below wahwah you will see a line and then more effects click the arrow at the bottom and you should see GSNAP
Gsnap/GVST Not Enabling or Showing Up
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Please state which version of Windows you are using,
and the exact three-section version number of Audacity from "Help menu > About Audacity".
Audacity 1.2.x and 1.3.x are obsolete and no longer supported. If you still have those versions, please upgrade at https://www.audacityteam.org/download/.
The old forums for those versions are now closed, but you can still read the archives of the 1.2.x and 1.3.x forums.