Is it about bandwidth, how fast they can download files from the internet? Something about the quality of audio files or photos? Or does it have something to do with file size, which is measured in bits and bytes (and mega-, giga-, and tera-)? MacOS is going to require that all apps be 64-bit in the future, and most average users have no idea what that means. In the example alert shown above, this is a good example Apple doesn’t explain much, but this dialog suggests that something is awry. Understanding the difference between 32-bit apps and 64-bit apps can be confusing as such terminology is often obscure, and sometimes is understood only by initiates. What’s the difference between 32-bit and 64-bit apps?
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Depending on how many old apps you have, and how many of them you use often, you may have seen it many times by now.īelow we’ll explain what the “app name” is not optimized for your Mac alert means, and how to find apps that will need updating. This alert first appeared when macOS 10.13.4 was released, back in April 2018.
The somewhat vague dialog that says that the app is “not optimized for your Mac” and “needs to be updated by its developer” offers little help as to why that is the case. And you may be wondering a few things, such as what are 32-bit and 64-bit apps, and why do they matter? We’ll get to that below, but first, let’s cover some things you may be encountering as part of this change.Īpple has been gradually pushing developers to move their software to 64-bit since mid-2017, and as part of its agenda, in recent month, you may have seen a popup message like the one below when launching apps on your Mac. You may have heard recent news about Apple’s warning to end users that the company intends to phase-out 32-bit apps running on macOS computers in 2019, with the release of macOS Catalina. Software & Apps What are 32-bit and 64-bit apps, and why do they matter?
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