IOS – Can’t install Find My iPhone app on iPhone 4 as it requires iOS 8

Unfortunately, This is not possible due to current App Store limitations unless someone else with a jail broken iPhone that you trust has a copy of it that you can grab. One problem with dealing with the Apple App Store is that older versions are forever lost due to Apple's App Store polices. We should be giving concerned feedback to Apple to address this issue too, not just the app developers. So it looks like your best option if you need to have the Mint app, is to read up on the latest jailbreak, and insure your jailbreak path, then update your iPhone to the latest iOS, and then re-jailbreak it. The good news is that there is a untethered jailbreak for both iOS 5 and iOS 5.0.1 for the iPhone 4 as referenced in my comment above.

If an app is "Universal," then it will contain code for both the iPhone and the iPad. When launched, iOS detects this, and the app will automatically display a UI that is appropriate for that device.

The only way to change this behavior would be to modify the core system behavior, which could be done only on a jailbroken phone.

The exception is found in applications where the developer has two completely separate applications for iPhone and iPad. In that case, you could force the iPhone app to be installed on an iPad.