If you download via iTunes the size is only 1Gb. Apple should have warned users about this. 5.5Gb is a big download....
At the moment, depending on your device model, iOS 7.1.2 is still available for some users who do not want iOS 8, that is until Apple signs it off completely. The rule is to back everything up first before attempting the downgrade.
Apple are quite clever and cunning in how they have launched this latest update. In particular with iCloud Drive, making it impossible to access the iCloud until all of my Apple devices have been upgraded to 8. I find this prescriptive compliance annoying, plus it requires a monthly subscription to use the cloud. I did see that Apple have pulled the OS update for the iPhone 4. I expect another update will be released soon to fix the bugs.
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