What the? It just jumped from 400MB down to 100MB. And now it's stopped. It'll do nothing when pressing Update 
When the Combo updater is released, I hope some kind chap or chapette posts the link as had been done in the past.
Same, 716MB here for my Macbook Air 11 (Early 2015). It downloaded the first 200MB super fast and now it's saying 18mins and counting up and up.
Edit:
lol now showing 38 minutes left. 47 minutes left! 49! 55! 1 hour 15 minutes! Keeps going up and up
Edit 2:
Update failed. Clicking Update does nothing now.
your wish is my command!Today would be nice for iOS 9.3.3 too
Well there won't be another el cap update.One must be a total idiot to rush into installing this.
Well, but then again, I guess it will be the same people who buy the new iPhone 7 with no-headphone "feature"
Ok, now a combo update with iTunes. 592MB. Downloaded the first 177 in a blink and now it's stopped at 182.
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Just as slow through those sadly, immediately plummets.
Are you only using 1 Mac on your network? Using iCloud? Doing app updates? It's unlikely an OS would use 5x more data than you claim. Some ISPs count uploads as well which includes the packets that upload for every download. You should see if your ISP has a network usage monitor so you can see your remaining quota all the time to determine if it happens when you're doing stuff on your Mac.Maybe the will fix the excessive bandwidth issue so I don't get charged for using 500 gigs a month when I actually only use a 100. Doubt it.
guess i'm glad it stopped...must have been another quick update. Initial download on both of my machines was 716mb, after they stopped and I restarted the download they are now 826mb, and moving much faster.
Same on my end. Downloads some amount at max speed and then drops to dial-up.
I did. Are you using the link from here? https://support.apple.com/kb/DL1885Combo updater link keeps failing...anyone having success?
No was using the link to the pkg combo. Used link you provided and it's moving pretty quick....thanks!I did. Are you using the link from here? https://support.apple.com/kb/DL1885