8/16/2023 0 Comments Legit old mac os isoClick the I logo in the top left of macOSģ. How to check if your Mac can run a particular OS X version:ġ. There are ways to get around that, but it’s not usually a good idea, because your Mac will usually be slower as a result. That’s because Apple periodically drops support for older Macs that can’t run later OS X releases effectively. You’re more likely to run into problems when you try to run a new version on an older Mac. In general, if you want to run an older version of macOS, it should work. Follow the on-screen prompts to install macOSĬheck you can run the older version of macOS.Prepare your Mac for the installation, if necessary.Use your installation disc or drive to boot up your Mac.Find and download a macOS installer file for the version you want to install (sometimes this is a.Check your Mac meets the system requirements to run older OS X versions.To install an older version of OS X on a Mac, you need to: In situations like these, installing an old version of the operating system may be your best choice. Or you might have old software that can’t be run on run on newer macOS versions like Big Sur and Monterey. Older Macs often run better with earlier versions of macOS, for example. And eventually, Apple stops supporting older editions of macOS - and that means no more security patches.īut there are some good reasons to do it anyway. After all, newer versions of the operating system have more features. Save the file and then power on the Virtual machine.On the face of it, running old versions of macOS on your Mac seems counterproductive. Here are the settings I used for the Big Sur Virtual Machine.īefore powering on the VM add the following lines to your bigsur.vmx file (use notepad to edit) smbios.reflectHost = "TRUE" Win-update-tools.cmd - retrieves latest macOS guest tools On Windows you will need to either run cmd.exe as Administrator or usingĮxplorer right click on the command file and select "Run as administrator". Virtualizing Big Sur with Vmware WorkstationĪfter creating the ISO you can apply this hack to Vmware Workstation 15 pro to allow you to install Big Sur. That’s it, you are done, you now have the Big Sur in ISO format, the size is approx 12.4GB after creation. In finder, locate the bigsur.cdr file and rename it to bigsur.iso. ![]() Convert mediaĪs root enter the following command, replace my username with your own: hdiutil convert /tmp/bigsur.dmg -format UDTO -o /Users/Niall/Desktop/bigsur.cdr If it doesn’t unmount, unmout it in Finder. Detach created mediaĪs root enter the following command: hdiutil detach /volumes/Install\ macOS\ Big\ Sur Install media now available at “/Volumes/Install macOS Big Sur” Step 6. Mount DMGĪs root, issue the following command Nialls-MacBook-Pro:tmp root# hdiutil attach /tmp/bigsur.dmg -noverify -mountpoint /Volumes/bigsurĪs root enter the following command: sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia -volume /Volumes/bigsur -nointeractionĬopying to disk: 0%… 10%… 20%… 30%… 40%… 50%… 60%… 70%… 80%… 90%… 100% ![]() In the terminal, login to root (I used sudo -i as my user was a member of Wheel) Last login: Wed Nov 18 08:35:21 on ~ % sudo -iĪs root issue the following command hdiutil create -o /tmp/bigsur -size 12685.1m -volname bigsur -layout SPUD -fs HFS JĬreated: /tmp/bigsur.dmg Step 4. It will take some time to download (12.18GB).Ĭlick on the magnifying glass (spotlight search) and type terminal. In the App Store search for Big Sur and when you find it click Get. Download Mac Os Big Sur from the AppStore I did this on a Macbook Pro (13 inch, 2017) running Big Sur. ![]() The method I used is detailed below, your mileage may vary. I needed the Big Sur ISO (to create a virtual machine) to test various things like Intune and Jamf enrollment but doing so was tricky and these are my rough notes. Big Sur is the latest version of MacOS from Apple.
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