Hello all, I'm having an issue while trying to update from macOS Mojave to Big Sur,
The update goes until the end 12.18 GB in total. But after download ends the "Install" button never appears, is just getting stuck on 12.18GB.
I tried twice in normal mode and one time in safe mode and behavior is the same (see bellow)
Can you help please?
Macbook used : MacBook Pro 2019 Touch Bar 15"
MacBook Pro 15″, macOS 10.15
I found a way.
MacOS Updated now. :)
Current Behavior:
Explanation:
How to solve it:
It seems that for some reason the download progress bar is not giving the right percentage/results or for some reason is saying that is everything downloaded but is not.
(Sorry for my bad English is not my native language)
Mine is stuck at 12.20, not even moving a bit
No, is not suppose to start from the beginning.
When you disconnect and connect the network. Download will verify where it really stopped. and will continue from this exactly point.
Ex: got same behavior (Stuck on 12.18GB) disconnect network (update progress bar disappear and a message appears saying that some issue regarding network occurred), connect network again. Check for update, click upgrade button. Progress bar starts to grow fast (checking already downloaded data) until certain point with will stop and really start to download the remain data.
But it can occur to get stuck again on 12.18Gb repeat the procedure and you will notice that the download is growing and the last check point (real downloaded data) is different from the previous.
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.
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!
download first stuck at 12.18, then at 7.56. tried this fix and it worked. according to progress bar, download started from the beginning but proceeded very rapidly until it was well advanced, then bogged down and finished very slowly. left it running and found it showing restart screen with 'about 10 min remaining.' that went normally until 'less than a minute remaining.' that minute took approximately forever, but the computer seems to be working now.
thanks, hamiltonfrommaputo.
I had the same problem. Do you have a firewall/av software that checks downloaded files in a sandbox? Disabling the sandbox on firewall fixed my problem immediately. I hope that helps someone else. This tip would have saved me a lot of time :-)
I saw a video that you can download updates from here https://support.apple.com/downloads/macos however, apple hasn't added Big Sur to the list.
MacOS Big Sur get stuck on 12.18 GB of 12.18GB
