Lightroom 5 will not open on my mac

I installed a multi-platform version of Lightroom 5 onto a pc, and I have recently switched to a macbook air, so I tried redownloading the same Lightroom onto the mac, and it will go through the installer and everything, but after I go through the basic introduction (terms and agreements, etc) it stops, and I cannot get it to go any further than that. PLEASE help me, I tried calling multiple times but to no avail

Mail 4.5 is correct for 10.6.8.
Can you give us some history?

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    @Lightroom 5 will not open and gives me a message saying it encountered an error reading from its preview cache.

    This is the Photoshop forum however.
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