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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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up vote 4 down vote accepted

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 (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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