In the System Information utility that opens, scroll down to Software in the sidebar and select Applications. From the Apple menu, choose About This Mac and then click the System Report button. How Do You Identify 32-bit Apps?Apple provides a tool to help you find 32-bit apps. But the writing is on the wall: 32-bits apps will cease working in macOS 10.15. However, maintaining that backward compatibility has a cost, in terms of both performance and testing, so at its Worldwide Developer Conference in 2017, Apple warned developers that High Sierra would be the last version of macOS to support 32-bit apps “without compromise.” At the next WWDC in June 2018, Apple announced that macOS 10.14 Mojave would be the last version of macOS to run 32-bit apps.Happily, the only “compromise” for 32-bit apps in Mojave is the warning dialog, which appears every 30 days when you launch an older app.Since it’s likely that you open old 32-bit apps only occasionally, you can’t trust the Legacy Software list to be complete.If you find System Information’s Applications list overwhelming, check out the free 32-bitCheck utility from Howard Oakley. However, this list may be smaller because it includes only those apps that you’ve launched. When it finishes, click the 64-bit column header (No means 32-bit Yes means 64-bit) to sort the list, and select an app to see its details in the bottom pane.This technique works in both High Sierra and Mojave, but in Mojave, System Information includes a better-formatted section, called Legacy Software, that also provides a list of 32-bit apps.
App Is Not Optimized For Your Upgrade Right AwaySo you need to establish a plan—it’s better to know what you’re going to do than to be forced into action if you have to replace your Mac on short notice. We expect Apple to release macOS 10.15 in September 2019, but you don’t need to upgrade right away—in fact, we recommend that you wait a few months after that to allow Apple time to fix bugs.That said, we do encourage upgrading eventually, and if you buy a new Mac after September 2019, it will come with macOS 10.15. Luckily, you have some time. Upgrade it: Apps in active development will likely have a new version available. There’s no need to waste drive space on them in macOS 10.15. Delete it: It’s not uncommon to have old apps that you haven’t used in years and won’t miss. Windows media components for quicktime for macReplace it: If no upgrade is available, the cost of upgrading is too high, or upgrading comes with other negatives, it’s time to look for an alternative. The apps that cause the most irritation here are things like the Adobe Creative Suite—Photoshop, Illustrator, and InDesign—that require switching to a monthly subscription. You can upgrade at any time, although it’s likely worth waiting until you’re ready to move to macOS 10.15 to minimize costs.
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