New Sierra update
Hello, I was wondering how much data is used to download the new update Sierra on my iMac, I have limited internet in my house, 5 GB a month to be exact. I don't mind paying for another GB or 2 if thats all it is. It says almost 5 GB of data but I am wondering if that is what it actually is. I had to take my iMac to a friends to download my current update El Capitan. Thank you for your time.
iMac