I have installed OS X on my iMac but it now tells me that i cannot use VM ware Fusion with OS X. How do I uninstall this upgrade and revert to the previous oS?

I have installed OS X but now find that i can no longer use VMware Fusion with this upgrade. I need VMware Fusion more than i need OS X. How do I uninstall this upgrade and revert to my old OS?

Try https://discussions.apple.com/message/23672167#23672167
Allan

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