You're a little late. iOS 7.0.1 was made available to the iPhone 5s and 5c when they launched last week. It was even available before that to those that had the device already.
It's also not 1.39GB. That's the entire ipsw you're downloading.
Just got my 5S in UPS today and must have missed the 7.0.1 news. It is in fact 1.39 GB so not sure why it isn't just downloading the update vs the entire ipsw?