This error happens when the digital security certificate of an older installer has expired. To fix this, delete the installer from your Applications folder, clear your Mac App Store cache, and redownload the file to obtain a fresh copy with updated certificates. Stuck on the Apple Logo
Verify that your Mac model matches or exceeds the following requirements: 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 or newer Mac Pro: Late 2013 or newer
Do not touch power, do not force shut down. If stuck on a progress bar for over 2 hours, then troubleshoot (see Step 6).
or put the computer to sleep during this process. how to update macos high sierra 10136 to 1015
If you are still running macOS High Sierra (10.13.6), you are several major releases behind. While High Sierra was a solid performer, it no longer receives security updates from Apple. Upgrading to at least macOS Catalina (10.15) (or newer, like Big Sur, Monterey, or Ventura depending on your Mac model) is critical for security, app compatibility, and new features.
Before downloading any files, verify that your computer officially supports macOS 10.15 Catalina. Go to the Apple menu (\apple) in the top-left corner of your screen and select . Check your model and year against the official compatibility list: 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 and newer) Mac Pro (Late 2013 or newer) Storage and Memory Prerequisites Memory : Your Mac must have at least 4 GB of RAM .
If your Mac is too old for Catalina, the highest you might be able to go is macOS Mojave (10.14). You can check your specific model via the Apple menu () > About This Mac . This error happens when the digital security certificate
High Sierra (10.13.6) will not always show Catalina in the standard "Software Update" section because it is not the latest version available (Big Sur, Monterey, Ventura, etc., are newer).
This is non-negotiable. If the upgrade fails, you could lose data.
macOS Catalina dropped support for many older Macs because it demands robust graphics capabilities. Before doing anything else, you must verify that your specific Apple computer model is supported by this operating system. Compatible Mac Models for macOS Catalina 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 or newer Mac Pro: Late 2013 or newer How to Check Your Model Click the Apple icon in the top-left corner of your screen. Select About This Mac . If stuck on a progress bar for over
If you need 32-bit app support, do not upgrade to Catalina. Instead, upgrade to – the last macOS to support 32-bit apps.
Mojave still runs most High Sierra apps and introduces Dark Mode and Dynamic Desktop.
Yes, only if your Mac supports Catalina. High Sierra (10.13.6) can go directly to Catalina (10.15) via the Software Update pane or the Catalina installer.
Clicking the link will prompt your browser to open the . Click the Get or Download button.