![]() But later in the day - around now 7:00pm to 8:00pm EST - I continued to get those “Installation failed: An error occurred while installing selected updates.” messages seemingly endlessly.Finally - after some time passed during the afternoon - my system was usable again due to Apple fixing their Gatekeeper/OCSP remote server.At one point I even ran Onyx to deep clean all of my Mac’s caches in an attempt to get my system to work not knowing about the Gatekeeper/OCSP stuff.I stopped the Big Sur download and attempted to get my system back to a usable state by force rebooting and such.Then - maybe at around 2:00pm or so - my system became slow to unusable due to the issues with Gatekeeper/OCSP and application signing.Despite that abysmal download speed estimate, I let the download run in the background as I did other things.I started the download and it was slow as molasses telling me it will take 12 hours to 1 day to download.I saw that Big Sur was released around 1:30pm EST.In addition to other answers here, I will explain what I experienced after Apple’s screw ups today. (Especially errors about SUPreferenceManager: Failed to set object of class - those do not prevent downloading the latest full installer)Ĭlear out your macOS system caches with Onyx, reboot your machine and try downloading it again. ![]() ![]() If you get any errors, don't worry - wait 5 minutes and try again. If you’ve done anything odd like clearing caches or run tools like Onyx, I recommend you do a safe boot to let Apple clean up properly, then run this command from your terminal. More details are here on recent changes to this weeks releases. Open the Mac App Store and find Big Sur.Quit any apps that cause internet usage (All web browsers, streaming or games, etc.).If you are having issues on or after Friday, November 13 and there isn’t an outage listed in the status page above, and step 4 above doesn’t work follow these steps: This is why failures happened globally on November 12 during the launch day of Big Sur installations. Apple servers had a documented outage to the software updates.
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