If you are adding a plugin to a C++ project than it needs to be in the project’s plugins folder. However if you are adding a plugin to a Blueprint project which does not have a C++ plugin project than I believe you need to add it to the Unreal Engine’s installation Plugin directory so that it is available to all Unreal Engine Instances. I am unsure of the details but it should work. Than you need to enable the plugin from your projects Plugins screen.
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