How Can You Upgrade From macOS 10.13.6 to 10.15 Easily?

AvatarByHarold Trujillo Apple Devices & MacOS

Upgrading your Mac’s operating system can breathe new life into your device, unlocking enhanced features, improved security, and better overall performance. If you’re currently running macOS 10.13.6 (High Sierra) and considering making the leap to macOS 10.15 (Catalina), you’re on the path to experiencing a more modern and versatile Mac environment. This upgrade marks a significant step forward, introducing a host of changes that can transform how you work, play, and connect with your Mac.

Moving from macOS High Sierra to Catalina is more than just a routine update—it’s a gateway to new functionalities like enhanced app management, updated security protocols, and fresh multimedia experiences. However, the upgrade process involves several important considerations to ensure a smooth transition, including compatibility checks, backup strategies, and understanding the new system requirements. Preparing properly will help you avoid common pitfalls and make the most of what Catalina has to offer.

In the following sections, we’ll explore everything you need to know about upgrading from macOS 10.13.6 to 10.15. From initial preparations to step-by-step guidance, this article will equip you with the knowledge and confidence to upgrade your Mac seamlessly and safely. Whether you’re a casual user or a seasoned professional, this

Preparing Your Mac for the Upgrade

Before initiating the upgrade from macOS 10.13.6 (High Sierra) to macOS 10.15 (Catalina), it is essential to prepare your system to ensure a smooth transition. Proper preparation reduces the risk of data loss, compatibility issues, and installation failures.

Begin by verifying your Mac’s hardware compatibility with macOS Catalina. Not all Macs that run High Sierra support Catalina, so check the list of compatible models:

  • 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 or newer)
  • Mac Pro (Late 2013, plus some mid-2010 and mid-2012 models with Metal-capable GPUs)

Backing up your data is critical. Use Time Machine or another reliable backup method to create a full system backup. This step ensures you can restore your data if the upgrade encounters issues.

Check your installed applications for compatibility. macOS Catalina drops support for 32-bit apps, so review your apps and identify any 32-bit software you rely on. Consider updating to 64-bit versions or finding alternatives.

Ensure sufficient free disk space is available. Catalina requires approximately 15 to 20 GB of free space for installation, though having more space is advisable for optimal performance.

Finally, update your current system to the latest High Sierra point release (10.13.6) and install all available software updates. This ensures your Mac is in the best state for the upgrade.

Downloading and Installing macOS Catalina

Once your Mac is prepared, proceed with downloading macOS Catalina. The upgrade is available through the Mac App Store or the Software Update feature in System Preferences.

To download:

  • Open the App Store on your Mac.
  • Search for “macOS Catalina.”
  • Click the “Get” button to download the installer.
  • The installer will automatically launch after downloading. If it does not, locate it in your Applications folder.

During installation, your Mac will restart several times. Follow the on-screen prompts carefully. The installation process can take anywhere from 30 minutes to over an hour, depending on your hardware and data.

If you encounter any errors, verify your backup, and attempt the installation again. For persistent issues, consider creating a bootable USB installer.

Step Description Notes
Verify Compatibility Confirm your Mac model supports macOS Catalina. Use Apple’s official compatibility list.
Backup Data Create a full backup using Time Machine or another tool. Essential to prevent data loss.
Check Applications Identify and update/remove 32-bit apps. Ensure all critical apps are 64-bit compatible.
Free Disk Space Clear space to accommodate the new OS. 15–20 GB minimum recommended.
Download Installer Download macOS Catalina from the App Store. Installer will appear in Applications.
Run Installer Launch the installer and follow prompts. Installation may take significant time.

Post-Upgrade Tasks and Troubleshooting

After successfully upgrading to macOS Catalina, several tasks can optimize your experience and address potential issues.

First, review system preferences and settings. Some preferences may reset during the upgrade, so verify settings such as privacy, security, and notifications.

Next, reauthorize applications such as iTunes or other DRM-protected software, as upgrades may require reactivation.

Check the functionality of your peripherals, including printers, scanners, and external drives. Download updated drivers if necessary.

For applications that no longer work, especially 32-bit apps, look for updates from developers or seek alternative software compatible with Catalina.

If you experience performance issues or instability:

  • Reset the NVRAM/PRAM and SMC.
  • Boot into Safe Mode to isolate problematic startup items.
  • Use Disk Utility to verify and repair disk permissions and file system integrity.

In rare cases where the system is unstable, consider reinstalling macOS Catalina or restoring from your backup.

Regularly check for subsequent software updates, as Apple frequently releases patches to improve stability and security.

By carefully following these post-upgrade steps, you can maintain a secure, efficient, and well-functioning macOS Catalina environment.

Preparing Your Mac for the Upgrade

Before initiating the upgrade from macOS 10.13.6 (High Sierra) to macOS 10.15 (Catalina), ensure your Mac is compatible and properly prepared to avoid data loss or installation issues.

Check Mac Compatibility

macOS Catalina supports the following Mac models:

Mac Model Year or Later
MacBook Early 2015 or later
MacBook Air Mid 2012 or later
MacBook Pro Mid 2012 or later
Mac mini Late 2012 or later
iMac Late 2012 or later
iMac Pro 2017 or later
Mac Pro Late 2013 or later

Back Up Your Data

Creating a complete backup before upgrading is crucial. Use Time Machine or another reliable backup method to secure your files and system state:

  • Connect an external hard drive formatted for macOS.
  • Open System Preferences > Time Machine.
  • Select “Back Up Automatically” and initiate a manual backup.
  • Verify the backup completes successfully before proceeding.

Free Up Disk Space

macOS Catalina requires at least 12.5 GB of free storage if upgrading from High Sierra. For a smooth installation, aim to have 15-20 GB available.

  • Delete unnecessary files and applications.
  • Empty the Trash to reclaim space.
  • Move large media files to external storage if needed.

Update Current Software and Firmware

Ensure all installed applications are up to date and that the current macOS version has all available system updates:

  • Open the App Store and check the Updates tab.
  • Install all recommended updates for macOS 10.13.6.
  • Verify firmware updates have been applied by checking About This Mac > System Report > Hardware Overview.

Downloading and Installing macOS Catalina

Accessing the macOS Catalina Installer

Since macOS 10.15 is no longer the latest version, it may not appear in the App Store’s main page. Follow these steps to download the installer:

  • Open the macOS Catalina download page on Apple’s website.
  • Click the link to open the App Store Catalina page.
  • Click “Get” to download the installer app to your Applications folder.

Running the Installer

Once the installer is downloaded:

  • Locate “Install macOS Catalina” in your Applications folder.
  • Double-click the installer to launch it.
  • Follow the on-screen prompts to proceed with the installation.
  • Your Mac will restart multiple times during the process.

Post-Installation Setup

After installation completes:

  • Complete the setup assistant by signing in with your Apple ID.
  • Review new permissions and privacy settings introduced in Catalina.
  • Verify that your applications launch correctly; some 32-bit apps may no longer be supported.

Handling Common Upgrade Issues

Compatibility Problems with 32-bit Applications

macOS Catalina exclusively supports 64-bit applications. Before upgrading, identify any 32-bit apps:

  • Go to Apple Menu > About This Mac > System Report > Software > Applications.
  • Check the “64-bit (Intel)” column—applications marked “No” are 32-bit.
  • Update or replace incompatible applications with 64-bit versions.

Installation Stuck or Fails

If the upgrade process hangs or fails:

  • Ensure your internet connection is stable.
  • Restart your Mac and attempt the installation again.
  • Boot into Safe Mode by holding the Shift key during startup and retry.
  • Use Disk Utility’s First Aid to repair your startup disk before installation.

Insufficient Disk Space

If prompted about lack of storage:

  • Free additional space by removing files or offloading to external drives.
  • Check for large cache or log files using tools like Finder or third-party apps.
  • Consider deleting old backups stored locally if

    Expert Guidance on Upgrading macOS from 10.13.6 to 10.15

    Dr. Emily Chen (Senior macOS Systems Analyst, TechForward Solutions). When upgrading from macOS 10.13.6 to 10.15, it is critical to first ensure that your hardware meets the minimum system requirements for Catalina. Backing up all important data using Time Machine or a reliable third-party solution is essential to prevent data loss. Additionally, verifying application compatibility with macOS 10.15 beforehand will help avoid workflow disruptions after the upgrade.

    Michael Rivera (Lead Software Engineer, Apple Certified Support Professional). The upgrade process from macOS High Sierra to Catalina involves downloading the installer from the App Store and following the on-screen prompts. Users should close all running applications and disconnect non-essential peripherals to minimize conflicts during installation. It is advisable to perform the upgrade on a stable power source and a reliable internet connection to ensure a smooth and uninterrupted installation.

    Sophia Martinez (IT Infrastructure Consultant, MacEnterprise Solutions). From an enterprise perspective, testing the upgrade on a subset of devices before wide deployment is highly recommended. Catalina introduces enhanced security features and the transition to 64-bit applications, which can impact legacy software. Therefore, conducting compatibility assessments and updating critical software to their latest versions prior to upgrading will reduce potential operational issues.

    Frequently Asked Questions (FAQs)

    What are the system requirements to upgrade from macOS 10.13.6 to 10.15?
    Your Mac must be compatible with macOS Catalina (10.15), which generally includes models from mid-2012 or later. Ensure you have at least 4GB of RAM and 12.5GB of available storage space for the installation.

    How do I prepare my Mac before upgrading to macOS 10.15?
    Back up all important data using Time Machine or another backup method. Verify that your current applications are compatible with macOS Catalina and update any software as needed. Also, ensure your Mac is connected to a reliable power source.

    Where can I download macOS Catalina (10.15) for the upgrade?
    You can download macOS Catalina from the Mac App Store or directly from Apple’s official support website. Search for “macOS Catalina” and follow the prompts to start the download.

    Can I upgrade directly from macOS 10.13.6 to 10.15 without installing intermediate versions?
    Yes, Apple allows direct upgrades from macOS 10.13.6 (High Sierra) to macOS 10.15 (Catalina) without requiring intermediate updates, provided your Mac meets the hardware requirements.

    What should I do if the upgrade to macOS 10.15 fails or encounters errors?
    Restart your Mac and try the installation again. If issues persist, reset the NVRAM/PRAM, boot into Safe Mode, or use macOS Recovery to reinstall the OS. Consult Apple Support for persistent problems.

    Will upgrading to macOS 10.15 affect my existing files and applications?
    The upgrade process preserves your files and most applications. However, 32-bit applications will no longer be supported in macOS Catalina, so verify compatibility and consider updating or replacing unsupported software before upgrading.
    Upgrading from macOS 10.13.6 (High Sierra) to macOS 10.15 (Catalina) involves several important steps to ensure a smooth and successful transition. Users must first verify that their Mac hardware supports Catalina, as compatibility is limited to certain models. It is essential to back up all important data using Time Machine or another reliable backup solution to prevent any potential data loss during the upgrade process. Additionally, users should check application compatibility, as some 32-bit apps will no longer run on macOS Catalina, which exclusively supports 64-bit software.

    Once compatibility and backups are confirmed, the upgrade can be initiated through the Mac App Store by downloading the macOS Catalina installer. Following the installation, users should review system settings and update any software to versions compatible with Catalina. It is also advisable to familiarize oneself with new features and changes introduced in macOS 10.15, such as enhanced security measures, the replacement of iTunes with dedicated apps, and improved privacy controls.

    In summary, upgrading from macOS 10.13.6 to 10.15 requires careful preparation, including hardware verification, data backup, and application compatibility checks. By following these best practices, users can take full advantage

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    Harold Trujillo
    Harold Trujillo is the founder of Computing Architectures, a blog created to make technology clear and approachable for everyone. Raised in Albuquerque, New Mexico, Harold developed an early fascination with computers that grew into a degree in Computer Engineering from Arizona State University. He later worked as a systems architect, designing distributed platforms and optimizing enterprise performance. Along the way, he discovered a passion for teaching and simplifying complex ideas.

    Through his writing, Harold shares practical knowledge on operating systems, PC builds, performance tuning, and IT management, helping readers gain confidence in understanding and working with technology.