Update from iOS 6 to 7, but not to iOS 8? So...I'm still on iOS 6.1. I know, I know, pretty much nobody has iOS 6 now if they can help it. 
Well, I've recently freed up enough space on my iphone 5 to update to iOS 7, but I don't want the iOS 8, and I can't seem to get past that on the software update. Is there anyway I can get the 7 without having to get the 8 at all? Someone once suggested force update by computer, but I'm not sure how that works. Does anyone know, or am I stuck with iOS 6?
As I had mentioned in my comment, Apple is no longer signing iOS 7 which means you can either update to iOS 8 or stay on iOS 6. Usually after an iOS update release, the previous iOS version is supported for a little while and then the signing stops. Right now, Apple signs iOS 8.1.

If you want to know what firmwares are being signed by Apple, there is a neat little website which is updated with the information - http://api.ineal.me/tss/status