Will Lightroom 4 work with Mac OS 10.7.5?

I have bought Lightroom 4 from Adobe online and downloaded it to my Mac but can't open or activate it. Will it work with Mac OS 10.7.5?

Yes , light room 4 will work ..
Please see the system requirements of LR4 : http://www.adobe.com/products/photoshop-lightroom/tech-specs.html

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