May need to get a physic evaluation if you're contemplating taking your life over a plugin.
Answer to your first question, yes. So long as they're on the same server & you're directing the plugin to the correct directory, then yes it will work.
Your second question.. It sounds like your plugin is working. If you're getting re-directed that means you're trying to access the User Options on WP. It shouldn't redirect you if you're only trying to get to /wp-admin (At least to my knowledge)
Is your account an admin account? If not, that may be why you're getting redirected.
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