How To Update Macos High Sierra 10.13.6 To 10.15 -

30 GB minimum.

If you open System Preferences > Software Update on High Sierra 10.13.6, you might see "Your Mac is up to date." This is because Apple's CDN (Content Delivery Network) often deprecates upgrade paths for older OS versions.

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If you have a firmware password set:

Open your Safari browser and visit Apple’s official support page for downloading older versions of macOS, or use this direct link to open the App Store page: Get macOS Catalina on the Mac App Store. 2. Download via App Store 30 GB minimum

Select your primary hard drive (usually labeled Macintosh HD ) as the destination disk.

To create the installer, you'll need a USB flash drive with at least 16GB of storage. Once you've downloaded the Install macOS Catalina.app to your Applications folder, plug in your USB drive, open (found in /Applications/Utilities ), and paste the following command, replacing MyVolume with the name of your USB drive: This link or copies made by others cannot be deleted

After the installer finishes and you log in to macOS Catalina, the process isn't quite over. Here's what you can expect next.

The following Mac models natively support macOS Catalina 10.15 : : 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

, you must first verify your hardware's compatibility and then manually download the installer via the App Store, as it won't appear in the standard "Software Update" window. Step 1: Check Compatibility