After the update completes, your Mac will boot into macOS Catalina.

Any application marked with a will not run on macOS Catalina.

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Major operating system upgrades alter core system files. Skip preparation, and you risk data loss. 1. Check Your Storage Space

: Ensure you have at least 15 GB to 20 GB of free storage space on your hard drive to prevent installation loops.

This comprehensive guide covers everything you need to know to safely transition your Mac from High Sierra to Catalina. Step 1: Verify Hardware Compatibility

Note: If your Mac is older than these models, you cannot update to Catalina and must stay on High Sierra or install a lightweight Linux distribution.

macOS High Sierra 10.13.6 macOS Catalina 10.15 , you must first verify your hardware's compatibility and back up your data, as this update removes support for all 32-bit applications. If your Mac is officially supported, you can download the installer directly from the Mac App Store 1. Verify Compatibility and Requirements

How to Update macOS High Sierra 10.13.6 to macOS Catalina 10.15

Before attempting the upgrade, ensure your Mac hardware supports 10.15. Catalina generally supports Macs introduced in mid-2012 or later

: Catalina requires Apple's modern APFS file system . The installer automatically converts your drive from HFS+ to APFS during the upgrade process. ⚠️ Critical Warning: The 32-Bit App Drop