If on a laptop, keep it plugged into AC power.
one by one, checking for driver updates.
Before you begin, verify that your Mac model is officially supported by Catalina. Generally, most Macs from are compatible. 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 Technical Requirements: OS: OS X 10.9 (Mavericks) or later. Memory: At least 4GB of RAM (8GB recommended). how to update macos high sierra 10.13.6 to 10.15
Good luck, and enjoy macOS Catalina!
Once you've completed the preparations, you can begin the upgrade. The most straightforward method is via the Mac App Store. If on a laptop, keep it plugged into AC power
*If you are interested, I can also provide a guide on how to: are 32-bit or 64-bit Create a bootable USB installer for Catalina Perform a clean installation instead of an upgrade*
Run Disk Utility to repair any permissions if you experience slowness. Generally, most Macs from are compatible
Since macOS Catalina is no longer the latest version, it may not appear in the “Updates” or “Recommended for you” section. Use one of these methods:
Apple sometimes hides older OS versions. Use this direct App Store link: https://apps.apple.com/us/app/macos-catalina/id1466841314?mt=12