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After upgrading to Mountain Lion, I find that when I attempt to launch VMWare Fusion 4.0 I receive the error:

You can't use this version of the application "VMWare Fusion" with this version of OS X

Has anyone found any workarounds for this? Should I migrate to Parallels?

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2 Answers

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Upgrade to the latest version of VMWare Fusion, in your situation you will need manually download it as indicated below for the situation you describe in your question:

I upgraded to Mountain Lion and now VMware Fusion 4 won’t start. What happened?

Mountain Lion appears to detect some older versions of VMware Fusion 4 and prevent them from launching. To resolve this issue, login to http://my.vmware.com/ (free product registration required) and download VMware Fusion 4.1.3. It can be found under “Products & Downloads > All Downloads > VMware Fusion”

According to VMware Fusion and OS X Mountain Lion FAQ

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Meh, and 3 will never work. VMWare did have an upgrade campaign with reduced price not too long ago, but they failed to say "btw, 3 won't work on ML so better give us $ (rather than $$)" :-( – koiyu Jul 26 '12 at 15:20
Where you running a trial version of VMWare 4? – MrDaniel Jul 26 '12 at 16:56
Worked like a charm. Thanks! – frankthomas.lg Jul 26 '12 at 23:44
@MrDaniel Didn't get your question. I am running 3.1. VMWare had offered discount on upgrading to 4, which I didn't buy, but would've bought in a breeze if I had known that 3.x won't work on ML (which is stated in the FAQ you posted to). – koiyu Jul 27 '12 at 16:03
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Have you run the update utility in VMWare Fusion 4? VMWare Fusion -> Check for Updates... in the menubar. I've been running VMWare Fusion 4.1.x for several months on Mountain Lion with no problems.

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You don't get far enough to see the VMWare menu bar, the application can't even start. As mentioned in the other answer you must download the current version directly from vmware.com. – patrix♦ Jul 26 '12 at 13:36
Yes this is what you should have done before upgrading to MTN Lion – MrDaniel Jul 26 '12 at 13:39

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