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At least one user has managed to (Trusted Platform Module) to prevent Mac OS X from running on third-party computers. The report noted that users were able to install other operating systems such as Windows and Linux on Intel-based Macs, but that it was not possible to install from the DVD containing the Intel-based Mac OS X on similar x86-based PCs (i.e., systems that lacked a TPM). Download OS X 10.9 Mavericks on your Mac for free from the Mac App Store. It is also the last Mac OS X version that supports PowerPC-based applications, as Mac OS X v10.7 'Lion' dropped support for Rosetta. In 2020, 15 years following the announcement to transition to Intel processors, Apple announced a transition of the Macintosh to ARM.

Is your Mac up to date with the latest version of the Mac operating system (macOS or OS X)? Is it using the version required by some other product that you want to use with your Mac? Which versions are earlier (older) or later (newer, more recent)? To find out, learn which version is installed now.

If your macOS isn't up to date, you may be able to update to a later version.

Which macOS version is installed?

From the Apple menu  in the corner of your screen, choose About This Mac. You should see the macOS name, such as macOS Mojave, followed by its version number. If you need to know the build number as well, click the version number to see it.

This example shows macOS Catalina version 10.15 build 19A583.

Which macOS version is the latest?

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These are all Mac operating systems, starting with the most recent. When a major new macOS is released, it gets a new name, such as macOS Catalina. As updates that change the macOS version number become available, this article is updated to show the latest version of that macOS.

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If your Mac is using an earlier version of any Mac operating system, you should install the latest Apple software updates, which can include important security updates and updates for the apps that are installed by macOS, such as Safari, Books, Messages, Mail, Music, Calendar, and Photos.

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