How to install older version of Facebook Messenger in iPhone?

Okay my question is really very simple, How do I install the older and better version of facebook messenger and its mobile app in my iPhone 4? I don't have a backup copy but I do have one that I have downloaded from internet. I'm really sick of this new app for what I have to jump back and forth for every little thing I type. And by the internet browsing I don't think I'm the only one to feel agitated. Help please!

Added (1). Oh and BTW the version I want to install and have at the moment is FB Messenger 3.4xx.ipa.

I'm sorry to inform you of this but that app has being replaced, they might bring it back if more people complain about it been replaced but for now your stuck with the new virsion

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