heyyitsmike Said:

How to run High Sierra and older on an older Mac DOSDude1 wrote a similar patch for High Sierra and prior to that Sierra. With the patch installed you can go back as far as early 2008 models. The new operating system for Mac has been officially released at the September keynote 2017 and the hype is real. With a lot of tweaks and refinements, the new macOS High Sierra promises a user experience deemed for the future of technology, bringing Apple one step closer to VR, AR and gaming capabilities. Prior Mac OS versions will find Security Update 2017-001 Sierra or Security Update 2017-004 El Capitan available in the Updates section of the Mac App Store as well. Users can also choose to download macOS High Sierra 10.13.1 as an independent update package if desired by going to the Apple support website.

'Why can't I download macOS Catalina?: I have a MacBook Air 13-Inch, 2017 model but whenever i try to install it, it says that my mac is up to date. I even used the system preferences to search for a new update but it came up empty. What should I do?'

I even can’t understand why only some MacOS High Sierra. And also only in some routers. OF Course that’s a compatibility issue, but no make sense you have a computer that works by a chance, when it wants, and no update to fix from the manufacturer. I tried all these tricks but no way to works as should.

Download

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Try these Three Methods..

Can

A. Create a New Administrator User:

See if you can install this, through use of a new Administrator user.


B. Resetting the SMC and NVRAM:

Sometimes operations are performed and then the keyboard settings become manipulated, technically. So.. Try resetting the SMC and NVRAM. Then reboot, trying this once more.


C. Scan your Mac for Malware:

Malware, which makes you Mac, run in malicious manor. Use Malwarebytes Anti-Malware for Mac

  1. Download it
  2. Install it
  3. Update it
  4. Scan with it
  5. Remove what is Found
  6. Reboot the Mac
  7. Remove it, if desired: Malwarebytes uninstaller

Dec 25, 2019 8:32 PM

To get the latest features and maintain the security, stability, compatibility and performance of your Mac, it's important to keep your software up to date. Apple recommends that you always use the latest macOS that is compatible with your Mac.

Learn how to upgrade to macOS Big Sur, the latest version of macOS.

Check compatibility

If a macOS installer can't be used on your Mac, the installer will let you know. For example, it might state that your Mac doesn't have enough free storage space for the installation or that the installer is too old to be opened on this version of macOS.

If you want to check compatibility before downloading the installer, learn about the minimum requirements for macOS Catalina, Mojave, High Sierra, Sierra, El Capitan or Yosemite. You can also check compatible operating systems on the product-ID page for MacBook Pro, MacBook Air, MacBook, iMac, Mac mini or Mac Pro.

Why Can't My Macbook Air 2017 Download High Sierra 10.12

Make a backup

Before installing, it’s a good idea to back up your Mac. Time Machine makes it simple and other backup methods are also available. Learn how to back up your Mac.

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Download macOS

It takes time to download and install macOS, so make sure you're plugged into AC power and have a reliable internet connection.

These installers from the App Store open automatically after they've been downloaded:

  • macOS Catalina 10.15 can upgrade Mojave, High Sierra, Sierra, El Capitan, Yosemite and Mavericks
  • macOS Mojave 10.14 can upgrade High Sierra, Sierra, El Capitan, Yosemite, Mavericks and Mountain Lion
  • macOS High Sierra 10.13 can upgrade Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion and Lion

Your web browser will download the following older installers as a disk image named InstallOS.dmg or InstallMacOSX.dmg. Open the disk image, then open the .pkg installer inside the disk image. It will install an app named Install [Version Name]. Open that app from your Applications folder to start installing the operating system.

  • macOS Sierra 10.12 can upgrade El Capitan, Yosemite, Mavericks, Mountain Lion or Lion
  • OS X El Capitan 10.11 can upgrade Yosemite, Mavericks, Mountain Lion, Lion or Snow Leopard
  • OS X Yosemite 10.10can upgrade Mavericks, Mountain Lion, Lion or Snow Leopard

Install macOS

Follow the onscreen instructions in the installer. It might be easiest to start the installation in the evening so that it can be completed overnight, if needed.

If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.

Please allow the installation to be completed without putting your Mac to sleep or closing its lid. Your Mac may restart, display a progress bar or show a blank screen several times as it installs both macOS and related updates to your Mac firmware.

Learn more

Why Can't My Macbook Air 2017 Download High Sierra Leone

You might also be able to use use macOS Recovery to reinstall the macOS you're using now, upgrade to the latest compatible macOS or install the macOS that came with your Mac.