How to get instagram without iOS?

I don't know how to upgrade my iPhone 4 I just got it and I tried downloading instagram but I can't. : it keeps telling me about iOS Thiny idek about and i don't know how to get it! How can I get instagram without it tho?
And I want to be able to upload pics and stuff and you can't do that on the Internet instagram help!

You can only use the iOS.
You can view, favourite and comment on uploads on statigr.am (website) - but you need an account.

Go into settings and download the latest software upgrade.
It will be settings > general > software update

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