1015 — How To Update Macos High Sierra 10136 To

Upgrading from macOS High Sierra 10.13.6 to macOS Catalina 10.15 is a significant jump that transitions your system to a 64-bit-only environment. Before you begin, you must verify your hardware compatibility and prepare your data, as this update reformats your drive and drops support for older 32-bit applications. Phase 1: Compatibility & Preparation Updating and Upgrading macOS High sierra - Apple Community

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 10136 to 1015

Before starting, ensure your Mac model supports macOS Catalina. Generally, models from mid-2012 or later are compatible. : Early 2015 or newer MacBook Air / Pro : Mid 2012 or newer Mac mini / iMac : Late 2012 or newer : Late 2013 or newer System Requirements : At least 4GB of RAM and 12.5GB of available storage. Apple Support 2. Prepare for the Update Back Up Your Data Time Machine or an external drive to back up your entire system. Check for 32-bit Apps : macOS Catalina only supports 64-bit apps . Use the free utility Upgrading from macOS High Sierra 10

to identify which of your current apps will stop working after the update. Update High Sierra App Store > Updates and install any pending security updates for 10.13.6 first. Apple Support Community Step 3: Run the upgrade

Correction on version numbers: macOS High Sierra’s final version is 10.13.6. The next major version was macOS Mojave (10.14), followed by macOS Catalina (10.15). If your goal is to reach a modern, stable OS, we will cover updating to Catalina (10.15). However, be warned: Catalina drops support for 32-bit apps.

Step 3: Run the upgrade

• Once download finishes, the installer should open automatically. If not:
  Finder > Applications > double-click “Install macOS Catalina”.
• Click Continue → Agree to terms.
• Select your startup disk (usually Macintosh HD).
• Click Install and enter your admin password.

If you actually want 10.14 Mojave instead of 10.15:

• Search the App Store for “macOS Mojave”.
• Download and run Install macOS Mojave (same steps as above).

Introduction

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.

This article provides a complete, safe, and detailed method to upgrade from macOS High Sierra version 10.13.6 to macOS Catalina version 10.15. We will cover prerequisites, compatibility, backup, the upgrade process, troubleshooting, and post-upgrade steps.