Why won't iOS 8 install on my iPhone 4s?

Been trying to install the update all week and it keeps getting to almost 100% installed and downloaded and then it says it can't install IOS 8. I can't find a reason as to why it won't install, any advice?

I wouldn't run ios 8 on under iPhone 5, simply because the new software is designed for the faster processors.

IOS8 runs just fine on iPhone 5. It may be slower on 4s, though.

Are you trying to do an OTA update? Or an update through iTunes.

If you're having problems doing it through OTA, you may not have enough free space, even though it thinks it does. (especially if you only have an 8gig phone). Try the update via iTunes to see if that helps.

I wouldn't install it if I were you, it doesn't run well for it. IOS 7 wasn't even supposed to go on the iPhone 4 and 4s.

It's your phone trying to prevent its processor from being over taxed… Don't do it, seriously.

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