Starting with 10.15 Catalina release of macOS, Apple is no longer supporting or allowing the use of 32-bit applications. The information below will show you how to check which program you already have installed that are 32-bit, that will no longer function after the upgrade to macOS 10.15 Catalina is performed.

 

Please ensure that you check for application compatibility before upgrading to the latest version of macOS.

 

You can check your apps for 64-bit compatibility manually with the following steps.

 

1. Click on the Apple icon in the top left of the menu bar.
   
   
2. Select About This Mac.
   
   
   
3. Click on the System Report…
   
   
   
4. Use system report to drill down on the applications running on your MacBook
   
   
5. In this next window, scroll down until you see the Software section in the sidebar.
   
   
6. Click on the Applications option under Software.
   
   
7. This is your list of applications. You can navigate by scrolling, using the arrow keys or typing the first letters of an app.
   
   This report will show you the 32 bits apps when you are on Mojave or other prior macOS.
   

 

Once you’re in this list, click on any app. You should see a section titled “64-Bit (Intel).” Yes means the app is 64-bit, No means the app is 32-bit and needs to be updated.

Older Microsoft apps will no longer function and require updating.

 

By default, macOS will display a dialog box if you attempt to open a 32-bit app when using macOS Mojave 10.14. The popup will say that the app is “not optimized for your Mac,” or something similar.