Why can't I install iOS 8.0 on my iPhone 5?

Why can't I install iOS 8.0 on my iPhone 5?  When I try to install it, a message says that I need 4.6 GB of storage available to install the update to the operating system, although the specs from Apple state that the update is 957 MB.  I have 1.2 GB available.  Do I have to delete all music (4.6 GB) and some of my apps to install this update?

If you have a Computer with iTunes you will not need to make that room available.  If you do have to upgrade via WiFi you will have to make nearly as much memory available as it says (a little less typically works).  Any Apps you purchased will be available in the App Store if you go to Update and click on Purchases.  Then you will see all the Apps that you have ever purchased from the App Store and you can download them for free.  With regard to any of you Photos or Music that you may need to delete to make room you will need to ensure that those were already in some Backup at iCloud or on your Computer.  Even though iOS 8 is less than a GB the process of downloading and unpacking and preparing things takes the extra memory. 

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