
This issue started around 2:00PM CST on Big Sur Launch Day.
QUICKEN FOR MAC 2018 RUMORS INSTALL
Install this package and it will put macOS Big Sur into your /Applications folder! What this will do is download the entire InstallAssistant.pkg file. You can download the full macOS Big Sur installer directly from Apple’s servers via Safari. UPDATE 11/27/20 – I’m still getting a bunch of people reaching out saying that they are still getting the error even after Apple fixed the issue! I have a fix for you via Hyram Hakkenbecker. Big Sur Full Installer.app Download Problems – “Installation Failed Error Occurred while installing the selected updates.”

Big Sur progress gets stuck mid installation – Black Screen with Apple Logo stuck or stopped progress bar

UPDATED 2/14/21 – List of macOS Big Sur Installation Issues. macOS Big Sur Install Issues Table of Contents

Macintosh video that goes over some of the known Big Sur Install issues.
