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.
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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.
Feb 23, 2018 Regarding this, you should create an app password. If you are not clear about this, you can get help from your Office 365 admin. If your account does not be turned on two-step authentication, and the issue persists, please try to remove your account from Mac Calendar App. Oct 09, 2019 Scroll down to the Software list on the sidebar. 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. Sep 15, 2017 Calendar scrolling still sometimes stops working in macOS 10.12.4 (16E195) Click to expand. Scrolling is just a bit too complex for apple, don't expect them to be able to figure it out.
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32-bit apps can run on a 64-bit system as they've been doing for years, but Apple wants to get rid of outdated apps to make sure everything that runs on the Mac is properly optimized and isn't an unnecessary drain on system resources.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:
- Click the Apple symbol () in the menu bar on your Mac's desktop.
- Click on About This Mac.
- Choose 'System Report' at the bottom of the window.
- Scroll down to the Software list on the sidebar.
- 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.
Continuing to Use 32-Bit Apps
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.
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Guide Feedback
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Q. OS X’s Calendar app hung up on me, so I force-quit it. Now it doesn’t show any of my events and instead stays stuck on an “Updating calendars…” prompt. How do I get past that?
A. I’ve had this happen enough times on my MacBook Air--although not, for whatever reason, on my older iMac--that I’ve all but memorized the routine to fix it.
Should your Mac’s copy of Calendar undergo this malfunction and fail to progress past a useless state in which it displays none of your existing schedules and has that “Updating calendars…” message stuck in front, you should first try restarting.
I know, I know; tech-support departments always say that. But it doesn’t hurt to try.
If that doesn’t work, you should make sure you have a backup of your calendars before you do anything else.
That should be nearly automatic in most Mac setups: Either you have your calendar synchronized to an online service like Google Calendar or Apple’s iCloud, or you have Apple’s Time Machine software automatically backing it up to a separate hard drive.
(If you had Time Machine active but recently had its backups stop because this OS X utility said your backup drive was out of space, see my advice on freeing up room. If you have no backup at all, please buy an external hard drive and set up Time Machine before you do anything else with your computer.)
Now switch to the Finder, hold down the Option key, click the “Go” menu and select the normally-hidden “Library” folder you revealed by holding down that modifier key.
The Library folder is the system’s designated store for data that individual applications use but which you don’t view or edit outside of those apps. Think browser bookmarks, your e-mail archives, application preferences… and your calendars.
OS X hides your Library by default--until 2011’s OS X Lion, it was viewable like any of your account’s other folders, from Documents to Downloads, but then Apple decided it was too risky to keep visible. I didn’t get the logic of that and still don’t, as it impedes routine troubleshooting like this and the Bluetooth snafu I covered here in April.
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With the Library open you should see a “Calendars” folder there. Delete that folder, reboot the Mac, empty the trash and then start up Calendar.
If your experience is like mine, Calendar should automatically pick up your synced calendars from Google or Apple’s servers. If you only had your schedules stored on your Mac, use that Option-click trick to make the Library folder visible, then click the Time Machine icon in the Dock to see your backups of that folder, then select Calendars to have that restored from this backup.
Note that if you’d hidden some of your calendars (for instance, Google Calendar includes a U.S.-holiday calendar that duplicates the one in OS X), they will now be visible again in the app. To hide them, click to clear the checkboxes next to those.
If, on the other hand, your experience isn’t like mine, please let me know in a comment or an e-mail.
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Rob Pegoraro is a tech writer based out of Washington, D.C. To submit a tech question, e-mail Rob at rob@robpegoraro.com. Follow him on Twitter at twitter.com/robpegoraro.