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.

1. There is no point in using older versions of Opera, the web is changing and old versions will not cut the mustard. The new Opera is sensational on performance even with 165 extensive tabs opened. I regularly do this and have no problems and still silky smooth scrolling etc.
2. OldVersion.com provides free. software downloads for old versions of programs, drivers and games. So why not downgrade to the version you love? Because newer is not always bett.

Archived Opera versions. Legacy version of Opera for Mac, Windows, and Linux can be found in the Opera archive. User agent string/ID. The user agent string for Chromium-based versions of Opera resembles the Chrome string with an additional browser signature: OPR/version major.version minor.build.patch (edition).

This example shows macOS Catalina version 10.15 build 19A583.

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Which macOS version is the latest?

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.

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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