If you are already jailbroken on iOS 9.3.5 (using tools like Phoenix), you have more power.

Disclaimer: This article is for educational purposes. Downloading IPAs may violate Instagram’s Terms of Service. Use at your own risk, and respect copyright laws.

Ensure your Apple ID has already "purchased" Instagram on a newer device. If not, log in to your account on a modern iPhone or iPad and download it there first. Step 2: Access Purchased Apps. On your iOS 9.3.5 device, open the and tap the Step 3: Filter for iPhone.