Installing Mountain Lion On VMware Fusion

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In our last article we showed you how to install Mountain Lion side by side Lion by dual booting it. But, if you truly want to run Mountain Lion at the same time you are running Lion, then you will need to install Mountain Lion on a Virtual Machine. To see how to install Mountain Lion on VMware Fusion, check out the below video. This video explains the complete process, from downloading Mountain Lion to creating a Virtual Machine using VMware Fusion and finally installing Mountain Lion on VMware Fusion, in just 6 minutes.


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About Vijay

Computer junky for 20 plus years and still obsessed with it. I enjoy exploring and tweaking popular operating systems and tinkering with computer hardware. Professionally, I work as a Storage Systems Administrator. When not on my computer, I love to travel, shop, read and hang out with my family and friends.


  1. Is this possible using Virtual box?

    • I haven’t tested it, but I am sure it should work with Virtual Box. Conceptually it is very similar. Do let us know how it goes.

      • Well the biggest problem I ran into was that that you cannot boot from the “Install Os Mountain” I found how to load Mountain Lion onto a usb on and then used the plop boot manager to let Virtual Box boot usb. Thats where things stopped working. I might be doing something wrong but it just didn’t work. So seeing that life is easier in the world of VMware I decided to go with that. It has since worked great. Thanks again for the great tutorial. If anyone can make it work on Virtual Box tell me what you did, I am curious (plus my fusion trial runs out in 29 days if I can’t scrap up the $50.)

  2. Thanks for the tutorial. It worked well. The only issue I’m having is that I can’t my new Mountain Lion VM to recognize the wide screen resolution capabilities of my display (iMac 21″) like it does for my Windows VMs. Any tips on that front?

    • Hi Tarek, Glad you liked it. Regarding the display resolution, I would recommend to run updates for VMware Fusion. Next, install VMware tools for your VM, specific to ML. Let us know if this helps.

  3. Great tutorial. I wanted to preview Mountain Lion before doing a full upgrade, so this is perfect. My only problem – I can’t sign in to my Apple ID in Messages. I’ve never had an iPhone before and so have never activated iMessages in any form.

    The message I repeatedly get is ‘could not sign in. Please check your network connection…’ I am connected to the internet and can browse the internet. I’ve tried all the different types of connections available in VMWare. I can sign in to my existing Apple ID (from iTunes and such) in iCloud and iTunes. But not Messages. What’s going on?

    • Very strange, I would recommend you try a few things;

      1. Install VMware tools.
      2. Make sure you virtual machine network is in Bridged mode.
      3. Make sure you are not signed into messages on the same physical machine running the VM.
      4. Try to create a new VM which meets the above conditions.

      Good Luck and let us know if you are able to resolve the issue.