IPHONE 5c instagram old version Phone will not update to IOS9?

I have a Iphone 5c and I have the IOS update that came with it, which is like an IOS 7, anyways I have not updated my phone since i got it, and Yesterday my instagram was acting up, I had notifications for when someone posted, and It kept sending me them but it was only old post, so i deleted the app and went to download the new version, but it won't let me download the current update, and also I tried updating my phone deleting a lot of things, but it would not update. Is there anyway I can download an older version of instagram for it to work on my IOS 7?

You can reset your phone to factory settings. Then update

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