How to get older versions of apps on iPhones?

I'm jailbroke but the app i'm looking for isn't in installous. So how do i get older versions of apps?

Installous is agents the law

You can't get old versions of App Store apps legally. If you have an old device and didn't back up the old apps linked to your account ahead of time, it may be time for you to get a new device to use the newer apps as most of them now require ios 4.3.x or ios 5

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