Opening Lightroom 4 Trial Version after downloading to a MAC

I have downloaded the free trial version of Lightroom 4 to a MacBook Pro, however when I try to open it after installation it just asks me if I want to re-install it? Has anyone else had this problem and if so do you have a solution? Thanks.

What Mac? What is the exact error message? If it's the notorious "critical components missing" it may mean that your Mac doesn't mean the requirements or something went wrong during install indeed...
Mylenium

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