FormacOS High Sierra, Open Safari and click on this link, How to get old versions of macOS - Apple Support. Go to Check Compatibility to see if your mac qualifies for the OS upgrade you want. Then go to the Download OS section and click on the OS you want to install. Before upgrading make a full back up of your Mac.

Downloadfor macOS. calibre works on macOS 11.0 (Big Sur) and higher. Download calibre. Version: 6.27.0 What's new. Alternate download location #1. Alternate download location #2. While you wait for the download to complete, please consider contributing to support the development of calibre. Previous releases of calibre are available here.
Howto update from macOS High Sierra to later versions. When I use the App Store option to get the macOS Monterey update it says no updates are available. I have iMac (Retina 5K, 27-inch, Late 2015, now using macOS 10.13.6. How to upgrade to macOS Catalina - Apple Support. And caution on 10.15 or higher, to see which Apps will no longer
Installan older Mac OS on an external drive for migration. If the Mac you're upgrading to (not from) is in the right range of vintages, you can do the following: Install Mac OS X 10.11 El 13 macOS 10.12 (Sierra) September 20, 2016: With Sierra, Apple shifts to the "macOS" naming. Again, more iOS perks arrive, such as unlocking a Mac with Apple Watch. There's also a new Storage Optimization feature with a detailed overview of storage and suggestions on how to free up disk space. And, hey Siri! Thelast release of Xcode supported on macOS High Sierra 10.13.6 is Xcode 10.1. So, officially speaking, your model of Mac cannot run macOS Catalina and by extension Xcode 11.x. There is no officially supported solution. Xcode 11.3 is supported on macOS Mojave 10.14.4 or later. So, your best recourse would be to be get a Mac that can run the
macOSSierra: 10.12: June 13, 2016: macOS High Sierra: 10.13: June 5, 2017: macOS Mojave: 10.14: June 4, 2018 * If your Mac is running OS X Lion or Mountain Lion, you must upgrade to El Capitan before you can upgrade to Catalina. If your Mac is running Mavericks or newer, you can proceed to upgrade to Catalina.
Compressa file or folder: Control-click it, then choose Compress from the shortcut menu. If you compress a single item, the compressed file has the name of the original item with the .zip extension. If you compress multiple items at once, the compressed file is called Archive.zip. Unzip (expand) a compressed item: Double-click the .zip file. IkK9v5.
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    • cara upgrade macos high sierra ke catalina