Downloading apps not on AppStore?

Is there a way to download apps that are not on the AppStore. I can't jailbreak because I upgraded to 6.1.3. I want to download a torrent player that was banned from AppStore so I can stream videos from piratebay.org from iPhone 4S.

I can't think of a way without jailbreak.
If you are able to find out, I'm interested to know as well.

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