Updating From High Sierra To Catalina


If your computer is running macOS 10.13 High Sierra or older, it will need to be updated or replaced to continue receiving security updates, as well as updates and new features for commonly used applications (such as the Microsoft Office 365 suite and Teams).

Guide: Update Directly to macOS Catalina. Update your existing Clover install to version r4910 or higher using MultiBeast or official Clover package. Open Clover configuration folder on the root of your system drive or EFI Partition using EFI Mounter v3. How to prepare for the macOS High Sierra upgrade. Now that you’ve decided that you cannot live without the new macOS 10.13 High Sierra, it’s time to thoroughly prepare for the upgrade. Do note that the beta version now available may not contain all the features, so if you want to upgrade for a specific feature, make sure it’s included. If your system is running on macOS High Sierra, Sierra, or El Capitan, then you can just go to the App Store and look for Catalina. Read the features and just install macOS Catalina from here. Alternatively, you can also go to the official website of Apple and click on the 'Upgrade Now' button to start the process.

Apple only officially supports the three most recent versions of macOS (currently 10.14 Mojave, 10.15 Catalina, and 11 Big Sur).

If you’re running an older version of macOS, it is no longer receiving security or stability updates. Running out-of-date, unpatched software, including operating systems, puts your data and the university at increased risk, and the university may restrict network access for devices running unsupported operating systems.

  • Further reading —Apple security updates

All UVM-owned computers running macOS 10.13 High Sierra or older must be updated or replaced as soon as possible to comply with the University Information Security Policy.

Which macOS version is installed?

Os x 10.12
  1. From the Apple menu in the top left corner of your screen, choose About This Mac.
  2. You’ll see the macOS name and version number, such as macOS Catalina 10.15.5; as well as your computer model and year.
  3. If your computer is running macOS High Sierra 10.13 or older it will need to be upgraded – make a note of your installed macOS version and your computer’s model and year as that information will be helpful when upgrading macOS.

Can my computer run a newer OS?

If you are running macOS 10.11 or newer, you should be able to upgrade to at least macOS 10.15 Catalina.

If you are running an older OS, you can look at the hardware requirements for the currently supported versions of macOS to see if your computer is capable of running them:

If your computer does not meet the minimum requirements for Catalina or Mojave, you will not be able to install a supported version of macOS. If this is the case, you will need to replace your current computer with a newer model.

How to upgrade macOS

The process of upgrading your computer varies depending on which version of macOS is currently installed on your computer.

Back up your data!

While data loss is relatively rare when upgrading macOS, it is best practice to backup your data via Time Machine or OneDrive before continuing.

Software Compatibility

As of 10.15 Catalina, macOS does not support 32-bit applications. If you are upgrading from an older version of macOS, you may need to also upgrade some of the applications installed on your computer.

Upgrade from macOS 10.11 or newer

If you are running macOS 10.11 or newer, you should be able to upgrade to at least macOS 10.15 Catalina. To see if your computer can run macOS 11 Big Sure, check Apple’s compatibility info and installation instructions. If your computer does not meet the minimum requirements for Catalina/Big Sur, please try upgrading to macOS 10.14 Mojave instead.

Upgrade from macOS 10.10 or lower

If you are running macOS 10.10 or lower, you will need to upgrade your computer to 10.11 El Capitan first. Once your computer has successfully upgraded to macOS 10.11 you can use the steps above to upgrade to a supported version of macOS.

Where can I get help with upgrading macOS?

Students can contact the Tech Team for assistance with or questions about upgrading their machine to a supported version of macOS.

Faculty, Staff, and Employees should contact their IT support unit. If you do not know who your IT Support Provider is, please use the IT Lookup Toolto locate the appropriate support resource for your department.

Known Issues with Unsupported macOS

Known issues related to running unsupported macOS versions on your computer:

Apple only supports the three most recent versions of its macOS operating system – this means many software developers will only release feature and security updates to devices that are running a supported version of macOS.

Running an unsupported version of macOS may limit access to features and collaboration tools in Microsoft Teams (such as breakout rooms) and Microsoft Office products.

The macOS operating system has root certificates built into it that allow your browser and other applications to validate the various websites and servers your computer connects to. This establishes a chain of trust that helps to prevent malicious actors from posing as legitimate websites.


Unsupported versions of macOS receive the “Your connection is not private” error because the root certificate that was used to vouch for UVM sites expired on May 30, 2020. The new root certificate used to validate connections to most uvm.edu sites is not included in macOS versions 10.11 or lower, which is why those systems can’t establish a chain of trust.

This issue can be resolved by upgrading your macOS version to 10.14 or higher using the steps above.

Update From High Sierra To Catalina

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Say hello to macOS 10.13 High Sierra, the new operating system for Mac desktops and notebooks that brings some impressive under-the-hood refinements. If you were expecting some big overhauls, chances are you’ll be disappointed at a first view. But look closer and you’ll discover the fine details that amount to a better user experience and more power for your Mac.

Upgrading to macOS High Sierra is seamlessly simple, taking up little time and almost no effort. And with the upgrade guide we’ve prepared, you’re going to be running the new OS in no time.

Macos 10.15

Why you should upgrade to macOS High Sierra

The team at Apple went right on target, tweaking those features and apps that promise to be in the spotlight in the near future. With a new and improved AFPS file system, a faster browser (which promises to be the fastest on the market), stellar graphics, better gaming capabilities, and VR support, macOS 10.13 is definitely here to make a stand.

To really give your Mac a boost, upgrading to the new High Sierra is kind of mandatory. Think only about how much space you’ll save with the new operating system that compresses video up to 40% more. macOS High Sierra also comes with an improved Photos app, that now offers professional editing tools that will keep you hooked to find the perfect composition. Of course, the most important upgrade comes from Metal 2, which promises stellar GPU and CPU capabilities while opening the world toward VR and AR.

So, to conclude: upgrade to macOS High Sierra for more space, speed, and power. We should have started with that, right?

How to prepare for the macOS High Sierra upgrade

Now that you’ve decided that you cannot live without the new macOS 10.13 High Sierra, it’s time to thoroughly prepare for the upgrade. Do note that the beta version now available may not contain all the features, so if you want to upgrade for a specific feature, make sure it’s included. Let’s go!

In order to prepare to upgrade to High Sierra you should, of course, verify if your Mac is compatible with the new system. As a general rule, any late 2009 Mac or newer will theoretically be able to run it without any issues.

Next, you should do a thorough Mac cleanup to have it running smoothly even before upgrading. A complete cleaning process includes deleting duplicate documents, photos, and files, while also removing temporary files and cache data that built up in the background. You can do this manually (if you have the patience) or you can turn to an app such as CleanMyMac X to have it do all the dirty work for you.

Having a healthy Mac is key to making the most and enjoying the best of macOS High Sierra. Thus, it’s mandatory to check if your Mac has any issues before performing the upgrade. How?

  1. Open Disk Utility
  2. Select your startup drive
  3. Click on the First Aid tab

If you’re lucky, your Mac won’t have any problems. But if you live in the real world, you’ll have to perform some repairs by using the Repair Disk. Restart and hold Command+R to perform the repairs with Disk Utility.

The final preparation step regards the free space necessary for macOS High Sierra. The official sources from apple.com recommend having 8GB of free space before upgrading to the new system, but we feel more comfortable with reserving about 15GB. What can we say, we like our space. If you don’t have enough space, that means you Mac still needs a bit of cleaning.

CHECK OUT: How to clean up your Mac to get more free storage space.

How to backup Mac before the upgrade

Backing up your Mac before a major upgrade is a necessity, especially if you’re going for a beta version. You don’t want to risk losing any precious info, so there’s no excuse for skipping this step.

You can easily backup your Mac by turning to Apple’s own software, Time Machine, that saves a copy of everything on your Mac on hourly, daily, monthly, and weekly backups. What’s more, except the automatic backups, you can also customize the process and have your most precious docs and files backed up manually from System Preferences.

In order to use Time Machine, you also need an external storage device. How big? The bigger the better. Choose your favorite from USB, SDD, NAS drive, or Thunderbolt hard drive.

Step by step upgrade to macOS High Sierra

Once you’ve prepared your Mac for the upgrade, it’s time to get the process started. Read on to find a comprehensive guide to a fast and safe upgrade.

  1. Choose a safe and trusted network for the upgrade
    All major upgrades should be done from a trusted network, adding speed and safety to your download and installation. The best place to perform the upgrade is from the comfort of your home network and you should avoid WIFI connections and especially hotels, restaurants, or public networks.
  2. Log into iCloud
    This step is pretty straightforward, yet necessary for the upgrade process, as many Mac apps have iCloud integrated parts. So, to have everything run smoothly, log into your account, and proceed.
  3. Update to the latest version of your current OS
    To avoid any problems in the upgrade process, having the latest updated version for your current OS is mandatory. Why? Because your OS is going to be as stable as possible, with all the initial issues fixed and all bugs eliminated.
    Make sure you’re running the latest updated version by checking the Updates folder in the App store.
    It’s also important to have all 3rd party apps updated to their latest version as well. Check the apps purchased through the App Store by using the same method as above. For the other apps you’ve externally brought in you’ll need to perform a manual update.
  4. Download macOS High Sierra
    Right now, macOS High Sierra is already available for all users. You can download it in the standard fashion on the Mac App Store.
    Here's the direct link.
  5. Upgrade to macOS High Sierra
    Open the installer from Applications (if it doesn’t open automatically) and hit continue. The on-screen instructions are going to make it really easy for you, so follow them religiously and you won’t be able to do any wrong. That’s it!

Next, make sure to set up for automatic updates from your System Preferences and the App Store, in order to always have your Mac performing at its best.

Why Is Macos Sierra Not Downloading

So there you have it! We hope you enjoy the upgraded features and your Mac’s new regained speed and, hopefully, extra space.