MacOS Big Sur get stuck on 12.18 GB of 12.18GB

I have the exact same problem. It (Finally) gets to 12.18 Gb but then stops. It then waits there for 15 mins at least before giving me the error message saying that it can't install. I don't know how a HUGE tech company can fail this badly.

I've tried doing this a couple of times since it was sent out yesterday at 6pm (GMT) and this is the furthest that the install has gone, the other times it has failed before even starting to download or it would download about 5Gb and then fail. Either way, this is not what we are used to seeing from Apple.

One question I have:

Why does their support page say that the issue has been resolved when it clearly hasn't???

Anyway, good luck with getting this thing to install mate. It seems like were just gonna have to wait a few days for things to be ironed out XD

Trying hamiltonfrommaputo's solution. Download did not start from the very beginning just close enough to the beginning to draw this maddening process out again. Hopefully the 4th time is the charm. I will update this post as things progress.

On my 3rd iteration of your method (about the 7th iteration overall). Each time I disconnect from internet the download moves fast at first then slows down at an earlier point in the download than the earlier download. It's been setting on the same 12.18gb set point for the last hour plus. Only reason I am upgrading to Big Sur is that the upgrade to Catalina scrogged up my late 2015 iMac and I am trying to salvage the machine to where it's somewhat usable. I'm going to let it run overnight and see where we are in the AM.

So it's two days, later - Nov 15 and I'm getting the same issue maybe ten times. Your solution doesn't start things mid stream for me, it starts over, but much faster, almost like it has some of the download buffered. But yet, after about three minutes, we're stuck again at 12.18. Pretty sure when I die, St. Peter will say good news - you've been granted access to heaven, just as soon as the final bits of your download are complete.

Did repeated attempts work for you? I am up to about ten tries, and I'm not noticing anything different about my 12.18 stuck points. I can imagine there is one computer system at Apple serves up the final bit of data and that system is overloaded or not working. A better system on apple's part would be to give us a message that things are overloaded and to come back later rather than tease us with a partial download.

It is mind-boggling to me the fact that Apple is not jumping in to help with this issue. My Big Sur install started last night around 8:00 PM and by 2:00 AM the progress bar was almost to 100% but it didn't move after that. Looked again this morning at 9:00 AM and it was still at the same place. Some people online recommended to click on the power button and it would "wake up" the install. I tried that and it didn't work.

Now I have restarted the computer and it got worse, it only shows a black screen sometimes and some other times it shows password recovery screen.

I now have restarted the computer pressing down command and R before the chime to enter recovery mode and run disk utility's first aid and then Reinstall Big Sur utility. Right now it looks like it is either downloading or running the install with 18 minutes remaining. I also connected the computer via ethernet cable in addition to WiFi just in case the issue was a faulty (unlikely) wireless connection.

I don't know if this is going to work but at least I don't see a black screen... I'll keep you posted if it works.

After several failed attempts to reinstall Big Sur it kept restarting the computer, prompting for password presenting the progress bar at around 10% and restarting itself. I had to try restarting at Recovery mode with the command R option and trying to reinstall Big Sur from there. It finally worked probably after the 4th attempt. So, my conclusion is that what worked for me was to try to reinstall Big Sur from the recovery mode every time it failed until it worked.

If this doesn't work, call Apple Support and if they can't help right away, ask them to transfer you to a senior consultant.

Good luck people!

Thank you. I appreciate it, and thinking of this problem two ways 1) assume that a certain percentage of times it might work, 2) the other scenario is there's something particular about my situation that ALWAYS makes it appear to stop at 12.18, hang, and error out. My sample size is now about 25 total on two separate machines (2018 Mac mini, and 2018 MacBook Pro). So far, all stuck.

Hi. An IT professional here. On day 4 of working on 9 different machines in 3 different locations. All stuck on 12.18 GB. MacBooks, MacBook Pros, Mac Mini's, iMacs, ranging in age from 2013-2019. All stuck. I have had a couple load successfully, but none on the first day. Hoping we will be able to install soon.

Hi. An IT professional here. On day 4 of working on 9 different machines in 3 different locations. All stuck on 12.18 GB. MacBooks, MacBook Pros, Mac Mini's, iMacs, ranging in age from 2013-2019. All stuck. I have had a couple load successfully, but none on the first day. Hoping we will be able to install soon.

I appreciate knowing I'm not a alone. I'm a communications pro on my end. From an ordinary user POV, I'm getting a lot of come-hither comms about upgrading, but no notes that hey some of you guys might be stuck, that's normal for now. Not a crisis, but Apple comms could have done better.