MACOS BIG SUR 11.2.3 DOWNLOAD FAILED INSTALL
MACOS BIG SUR 11.2.3 DOWNLOAD FAILED UPDATE
MACOS BIG SUR 11.2.3 DOWNLOAD FAILED UPGRADE

But OS 11.6 wasn't actually installed, even though I received no error messages (no surprise given the extremely short run time). Less than a minute after I launched the downloaded installer it gave me the message 'Installation Complete'. I fetched the full installer as you recommended, using the Terminal command ' softwareupdate -fetch-full-installer -full-installer-version 11.6 ' When I performed the installation it didn't work as I had expected, but something positive happened. No CPU overload, no disk errors, plenty of free RAM, no memory pressure or sensor flags. I have run various diagnostics on my system.

MACOS BIG SUR 11.2.3 DOWNLOAD FAILED UPGRADE

It has over 1TB of free disk space and no other software running besides MacOS 10.15.7 Catalina while the system upgrade is being performed.

MACOS BIG SUR 11.2.3 DOWNLOAD FAILED UPDATE

I am performing the update on a fairly well equipped 2018 MacMini. The system indicates the update is downloading, but the update always fails during installation. I tried all of the advice suggested above without any effective results. I never see a single new file show up in my Applications folder. I monitored my Downloads and Applications folders during the installer download process and after the download completes. The error message I see is always the same: 'Installation Failed - An error occurred while installing the selected updates.' I get the same result every time I try to update/install Big Sur: The download happens without any apparent errors, Installation starts after download is complete, but aborts after 5 minutes of attempted installation. Otherwise I would expect to see the full installer appear in my Applications folder or be able to locate the file(s) using the Finder's Find function. It seems the downloaded files are never successfully joined into a single installer package. So, I suspect at least some of the files are cached, somewhere, from the original installation attempt and not being overwritten on subsequent update attempts. It took at least 30min to have presumably downloaded the whole update with the progress bar inching along the whole time. The first time I tried to update to Big Sur was yesterday. When I use the Software Update feature in System Preferences, 12.43 GB in files download within a few minutes, (the progress bar moves in spurts, but rather fast). What I am asking for is the location of these files and what they should look like, so I can try removing them before restarting the Software Update. So, I suspect whatever is downloaded is hidden or stored in an obscure system directory.

MACOS BIG SUR 11.2.3 DOWNLOAD FAILED INSTALL

The few files I can find that include the word install in the title are fairly old and under 5 MB (far too small to be considered an OS installer). No recent files can be found containing the words Install or 'Big Sur' anywhere on the Mac. According to what I have found online the full installer application should be named 'Install macOS Big Sur' and appear in my Applications folder even before the full download is complete.Īfter carefully searching and monitoring, no new files show up in my Downloads or Application folders during or after the installer is downloaded from Apple.

Macos big sur 11.2.3 download failed