If you’ve upgraded your Mac to macOS High Sierra or macOS Mojave you have likely seen an alert that looks like the one shown below. I’ll explain what this alert means and how you should handle this situation.

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Microsoft Word 2011 is only one of many applications that can trigger this alert, but Word 2011 is, by far, the most prevalent application that triggers this alert. This alert has generated a lot of uncertainty. If one clicks the Learn More button, you’re taken to Apple’s article which offers a mildly technical explanation of the situation. It also outlines what steps you can take, but let me try to present a clearer explanation.

In plain English, this alert is informing you that the particular application that you’re opening, such as Word 2011, is an older application and you need to plan to upgrade to a new version. You don’t need to do anything immediately, but you need to put a plan in place. The application you are opening will continue to work as long as your Mac is running macOS High Sierra (aka macOS 10.13) or macOS Mojave (aka macOS 10.14). However, that application will stop working when or if you upgrade your Mac to macOS Catalina (aka macOS 10.15), which’ll be released in the fall of 2019. Using technical terminology. These older applications are what we call 32-bit applications and they will no longer work with macOS Catalina. Instead, macOS Catalina only supports what we call 64-bit applications.

Microsoft officially stopped supporting and fixing security holes in Office 2011, including Word 2011, in the fall of 2017. At that time, I indicated that it was time to start to plan to upgrade to Office 2016. Flash ahead to June 2019 and Office 2019 is now the current version. As you make your plans you should decide if you want to purchase Office outright or via an Office365 subscription.

If you’re opening an application other than Word 2011 when you see this alert, please contact the developer to see if a newer version of the application is available. Specifically, you’re trying to determine if the developer has a version of that application which’ll be compatible with macOS Catalina (aka macOS 10.15).

If you want to be diligent you could review all non-64 bit applications on your Mac and identify the non-Apple applications which you rely on. Then build a plan to upgrade to 64-bit versions of the applications that are critical to you. Be aware that it’s possible that some applications are no longer being developed so 64-bit versions will never be available. In this case, you’ll need to find an alternative or replacement application. To build a list of all non-64 bit applications, do this:

1. Click on the Apple menu and select About This Mac
2. In the About This Mac window click the More Info button
3. The System Information application will open. On the left-hand side, click on Software.
4. Click on Applications
5. Wait a minute or two for an inventory of all applications on your Mac to be generated.
6. Click on the Column named 64-bit Intel to sort the list of applications by whether they are 64-bit or not.

You should see a list similar to the one depicted below:

You’ll be surprised by how many applications are installed on your Mac. You might not recognize many of them. Don’t worry about this. Focus only on the applications that you use that are not made by Apple. Apple will update all of their applications to be compatible with macOS Catalina. Hopefully, your list of important, non-Apple applications will be short. Then contact the developer of each of those applications to determine if there is already a 64-bit version available that is compatible with macOS Catalina or not. If so, plan your upgrade to that version. If not, do some research to find a replacement application that will meet your needs.

/gratis-backup-software-voor-mac.html. When macOS Mojave was announced, Apple warned that it would be the last version of macOS that would support older 32-bit apps. Apple has been phasing out 32-bit apps for the last 10 years and is now ready to take the final step, even if Mac users may not be ready to lose access to older apps.

With the release of macOS Catalina, 32-bit app support is no longer available, which means many of your older apps will no longer work if they haven't been updated to 64-bit.

32-bit vs. 64-bit

32-bit apps date back to a time when there were 32-bit processors and 32-bit operating systems, but are now outdated. Apple has long since transitioned to 64-bit processors and macOS has been 64-bit since the launch of Snow Leopard in 2009.

Compared to 32-bit apps, 64-bit apps can take advantage of more memory and offer faster system performance. Apple technologies like Metal only work with 64-bit apps, and for Apple to ensure that Mac apps include all of the latest advancements and optimizations, support for 32-bit needs to end. In the simplest terms, 32-bit apps are inefficient.

32-bit apps can run on a 64-bit system as they've been doing for years, but Apple wants to get rid of outdated apps to make sure everything that runs on the Mac is properly optimized and isn't an unnecessary drain on system resources.

Previous Warnings

Apple started warning Mac users about plans to end support for 32-bit apps back with macOS High Sierra. In High Sierra, users started getting warnings about a 32-bit app's future incompatibility with macOS.

A similar message was available in macOS Mojave, and if you opened up a 32-bit app while running Mojave, you saw an alert letting you know a specific app wouldn't work with future versions of macOS unless it was updated.

Alerts re-appeared every 30 days when launching an app, with Apple aiming to make sure customers would not be caught unaware when a 32-bit app stopped working in the future, so you should already know if one of your frequently used apps hasn't been upgraded to 64-bit.

Upon updating to ‌macOS Catalina‌, you'll be shown a list of 32-bit apps that no longer work on your system.

How to Check if an App is 32-Bit or 64-Bit in macOS Mojave

To determine whether an app is 64-bit or 32-bit and to see if there are 32-bit apps installed on your machine before upgrading to ‌macOS Catalina‌, follow these steps:

1. Click the Apple symbol () in the menu bar on your Mac's desktop.
2. Click on About This Mac.
3. Choose 'System Report' at the bottom of the window.
4. Scroll down to the Software list on the sidebar.
5. Select Legacy Software.'

Anything in the list of Legacy Software applications is a 32-bit app and will not work when upgrading to ‌macOS Catalina‌.

If Legacy Software isn't an option in the sidebar, select the Applications option and then check the list of apps at the right. The column that's labeled 64-bit will show a 'No' listing for apps that are 32-bit.

How to Prepare to Update to ‌macOS Catalina‌

The first step is to make sure there aren't already available updates for apps that you have on your system, which you can generally do by updating through the Mac App Store for ‌Mac App Store‌ apps.

Apps outside of the ‌Mac App Store‌ use other update methods that can vary by app, but for many, you can click on the app's name in the menu bar and choose the 'Check for Updates' option. Some other apps have more hidden update methods, so if you do have a 32-bit app, make sure to Google how to update it to be sure there's not already new software available.

After ensuring you've updated everything you're able to update, you can contact developers and ask them to update their apps, but if that doesn't pan out, the only other solution is to start the search for an alternative app if you're committed to upgrading to ‌macOS Catalina‌ or have already done so.

32-Bit App Warnings When Installing Catalina

When upgrading to ‌macOS Catalina‌, the installer will show a list of recently used apps that are 32-bit so you know what to expect before installing.

After viewing this list, you can choose to either cancel or continue with the installation.

‌macOS Catalina‌ also shows a stop symbol over the icon of 32-bit apps in the Finder, so you know that the app isn't going to open.

Aperture

With the release of ‌macOS Catalina‌, Aperture is going to stop working. Apple warned Aperture users in April 2019 that the software won't run in future versions of macOS, starting with ‌macOS Catalina‌.

If you're an Aperture user, you'll have to transition to alternate photo editing and management software, such as Adobe's Lightroom. Aperture is not 32-bit, but Apple is phasing it out all the same.

Affected Media Formats

Certain media files that use older formats and codecs are also not compatible with macOS after macOS Mojave due to the 64-bit transition, and you will need to convert some iMovie and Final Cut Pro X libraries. Incompatible media files were created using codecs that rely on QuickTime 7, and while macOS Mojave has QuickTime 7 frameworks, future versions of macOS will not.

Apple has a full list of media formats that are going to be affected by the transition available in a support document.
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Continuing to Use 32-Bit Apps

This Software Is Not Optimized For Your Mac Pc

In macOS Mojave and earlier versions of macOS like High Sierra, you can continue to use your 32-bit apps. If you have a 32-bit app that you absolutely depend on, you're going to want to think twice before upgrading to ‌macOS Catalina‌.

Guide Feedback

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Have questions about the end of support for 32-bit apps or want to offer feedback on this guide? Send us an email here.