As ever, a new version of iOS is a mix of excitement and anxiety. But this year's download seems a little worse than usual.Not that you'll know or care if your download of iOS went perfectly. For some, it has, even if it has taken some time due to the stress on Apple's servers. Many are happily enjoying an all-new Apple experience as I write.But some aren't. It was made available yesterday evening and as you would expect, Apple device owners threw themselves at the new-look operating system. But all those wannabe early adopters were playing a dangerous game.The rush to download meant Apple was unable to verify a number of the updates, which led to error messages for an unknown number, usually 'software update failed'. Others got the message 'Your iPhone could not be activated because the activation server cannot be reached. Try connecting your iPhone to iTunes to activate it, or try again in a few minutes.' It's likely to be better this morning, while America sleeps, but Apple is still taking the problems seriously enough to be treating it as a high priority.There's another problem too - size of download. The size of that download depends on the hardware you are updating. For example, an iPhone 5 download is around 790MB, while the iPhone 4 is said to be a massive 2.99GB in some cases. The size of the latter is an added problem, with some users being informed that there isn't enough room to download the update to their device. Time to upgrade your hardware? If that's the case, possibly.If you manage to get through all of that, you'll find that new departure in looks for iOS, along with a host of new functionality, along with the debut of iTunes radio - and all before it goes live on the new Apple phones. Want to know more? You can find out all about iOS 7 here.