If you want to upgrade an existing computer. You wont need to do anything to install it. If the App Store says ‘Open’ then it is detecting a previous download of the install app go to the Applications folder locate Install macOS High Sierra.app. If you buy a new Apple computer, High Sierra will come pre-installed. It will show you all the steps from setting up the USB install drive, provide you. I didn't quite understand the conclusion, but it seems that although it's possible to stay with HFS+ when installing 10.14 it's going to prevent any updates etc. When you go to the App Store High Sierra download page, it should say Get or Download. 929 118K views 4 years ago This guide will show you how to install macOS High Sierra 10.13.6 on your PC. I did find a thread entitled Is it possible to install Mojave and keep HFS+ ? where the OP mentions having several disk-related apps which can't handle APFS, but as far as I remember I have none of those (or am aware of apps that specifically will only work with HFS+, but then again it's nothing I've ever investigated properly either.). Answer the prompts on the Introduction, Read Me, and License screens. Now I'm in the process of upgrading my mid-2012 Macbook Pro (from 10.13.6 High Sierra to 10.14) and understand I'm back in the same situation, but I can't remember why I shouldn't move over to APFS and the implications of it if I do, and if whatever was problematic back then have improved/been resolved with 10.14. Double-click the downloaded file and click Continue to start the installation. I did what was suggested and stayed with HFS+. Once you have located the version of macOS you want on the Mac App Store follow these instructions: Hit Download or Get (depending on the version of the Mac App Store you are using). pkg to Install macOS Sierra.app located in the Applications folder. pkg will open an installation screen that converts the. Last time I upgraded (from MacOS 10.9 Mavericks to 10.13 High Sierra) I was told that if you install it on an SSD it would convert the drive to the APFS format (which I should avoid, using a workaround option for installing it along with HFS+). To download the latest version of the macOS installer for installing on a USB, open up the System Preferences and navigate to Software Update. How to upgrade to macOS Sierra - Apple Support You can see from Section 4 that it now downloads a file called InstallOS.dmg which when opened becomes InstallOS.pkg. Not only macOS High Sierra but you’ll also need a bootable USB drive to install new versions of macOS Mojave, macOS Catalina, and updated versions.
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