The download began—a hefty 8 GB file. Elias watched the progress bar under the Launchpad icon. It was slow, agonizingly so. He went to make coffee, then came back. It was at 50%.
This usually indicates a corrupted download or an inaccurate system clock. Go to System Preferences > Date & Time and ensure your Mac is set to set date and time automatically before restarting the download.
If your Mac gets stuck on the Apple logo progress bar for more than two hours, a hard reset may be required. Hold the power button down until the machine turns off. Boot the Mac into by holding down the Shift key while powering it back on to let the setup script finish. how to update macos high sierra 10136 to 1015
Stuck at version 10.13.6, need 10.15. Not… - Apple Community 12 Feb 2021 —
Never initiate a major OS upgrade without a current backup. If the installation fails or power cuts out mid-update, your data could be corrupted. Connect an external hard drive to your Mac. Open > Time Machine . Click Select Backup Disk and choose your external drive. The download began—a hefty 8 GB file
Before downloading any files, you must confirm that your Mac model officially supports macOS 10.15. Check Your Mac Model macOS Catalina - Technical Specifications - Apple Support
Before starting, verify that your Mac is officially supported. You can check your model by clicking the > About This Mac . Catalina-Compatible Mac Models: MacBook : Early 2015 or newer MacBook Air : Mid 2012 or newer MacBook Pro : Mid 2012 or newer Mac mini : Late 2012 or newer iMac : Late 2012 or newer iMac Pro : 2017 Mac Pro : Late 2013 or newer 2. Prepare for the Upgrade He went to make coffee, then came back
Open your web browser and navigate to the official Apple Support page for older macOS versions, or click the direct Mac App Store link for macOS Catalina.
I can tell you if a clean install or a standard upgrade is better for you. Share public link
macOS Catalina only runs 64-bit applications. High Sierra can run both. If you rely on older software (e.g., old Adobe CS6, some games, legacy utilities), they will break.