what is os x 10.9.5?
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OS X Mavericks (version 10.9) is the tenth major release of OS X (since June 2016 rebranded as macOS), Apple Inc.'s desktop and server operating system for Macintosh computers. OS X Mavericks was announced on June 10, 2013, at WWDC 2013, and was released on October 22, 2013 worldwide.
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The latest version of iOS and iPadOS is 13.6. Learn how to update the software on your iPhone, iPad, or iPod touch. The latest version of macOS is 10.15. 6.
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If you have macOS Sierra (the current macOS version), you can upgrade straight to High Sierra without doing any other software installations. If you are running Lion (version 10.7. 5), Mountain Lion, Mavericks, Yosemite, or El Capitan, you can upgrade directly from one of those versions to Sierra.
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Mac OS X 10.8 comes with Python 2.7 pre-installed by Apple. If you wish, you are invited to install the most recent version of Python from the Python website (https://www.python.org). A current “universal binary” build of Python, which runs natively on the Mac's new Intel and legacy PPC CPU's, is available there.
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It is part of macOS. Apparently it's the new device manager (it resided inside of iTunes before). It is used, for example, for backing up, updating or restoring an iPod, iPhone or other device connected to your Mac. If you want to pay a visit to that folder, you'll even find device icons.
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It was announced at WWDC 2019 on June 3, 2019, and was released to the public on October 7, 2019. Catalina is the first version of macOS to support only 64-bit applications and the first to include Activation Lock.
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Make sure you're ready to upgrade. Before you upgrade, we recommend that you back up your Mac. Then, if your Mac is running OS X Mavericks 10.9 or later, you can upgrade directly to macOS Catalina.
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['Download OS X 10.8 Mountain Lion from the App Store.', 'Go to the /Applications/ directory and right-click on “Install Mac OS X Mountain Lion.app” selecting “Show Package Contents”']
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Opera 63 was released on August 20, 2019, based on Chromium 76. It was the last version that would run under OS X 10.10, with later versions requiring OS X 10.11 or later.
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To see which version of macOS you have installed, click the Apple menu icon at the top left corner of your screen, and then select the “About This Mac” command. The name and version number of your Mac's operating system appears on the “Overview” tab in the About This Mac window.
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For Python 3.6 releases, we provide two binary installer options for download. The default variant is 64-bit-only and works on macOS 10.9 (Mavericks) and later systems. We also continue to provide a 64-bit/32-bit variant that works on all versions of macOS from 10.6 (Snow Leopard) on.
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What is the latest version of Firefox for Mac? Firefox 45.9. 0esr is the latest running version with security fixes.
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OS X Yosemite is available as a free download from the Mac App Store. To download and install the update, head to the  Apple menu and choose “Software Update”, the OS X Yosemite installer is several GB in size and can be found under the “Updates” tab.
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Windows 10 November 2019 Update (version 1909) Version 1909, called the Windows 10 November 2019 Update, is the most recent update to Windows 10. There are very few new features in this update, making it more like a service pack of old than a feature update.
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['Select File > New from the Fusion menu bar.', 'Select Install from disc or image and click Continue.', 'Drag and drop the Install OS X Yosemite application into Use operating system installation disc or image dialog box.', 'Click Continue.']
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['Open the Mac App Store (choose Store > Sign In if you need to log in).', 'Click Purchased.', 'Scroll down to find the copy of OS X or macOS you want.', 'Click Install.']
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['Apple Mac launched in 2011 or later*: ... ', 'Minimum 4GB of RAM.', '750MB free disk space for VMware Fusion and at least 5GB for each virtual machine.', 'Mac OS X 10.11.0 or later.']