Unable to install Lightroom 4 on imac 10.6.8

I am unable to install Lightroom 4 from the original disc on to my imac 10.6.8.  I successfully installed Adobe CS6 on to the imac without any difficulty.  While attempting to install Lightroom 4 I receive a screen that says "Installation Failure.  Unknown error.  Contact software adminstrator."  The imac has an intel core 2 duo processor, 2 gb ram.  The system requirements are the same as CS6 which installed without problems.
Any suggestions?
Thanks for any help!

Not sure... It states that 64bit support is required, which would preclude older iMacs and MacBooks and you seem to be using exactly one of those... I'm afraid this will not work.
Mylenium

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