LR4 upgrade on Mac OS x will not open.

[kgboxer]

I'm running Mac OS X 10.6.8 After downloading the upgrade from 3 to 4 I now can not open the application.   The message that pops up when I try says that this app is not supported on this type of Mac.  Anyone had this happed and if so how did you fix it?

[Manish-Sharma]

Are you certain you computer meet the minimum system requirement as per :- http://www.adobe.com/uk/products/photoshop-lightroom/tech-specs.html