Can't Install LR2 on my new iMac, it doesn't get past the validation point. What can i do to get this installed?

[NikyS5275497]

I just got a brand new iMac to replace my old G4 PowerBook, however when I go to install LR2 on it I can't.  I can't even get past the validation point in the beginning of the installation.  How to I go about installing this so I can continue doing photography editing?

[John Waller]

You cannot install or run Lightroom 2 on your new Intel-based iMac running OS X Yosemite.

Lightroom 2 was written for old PowerPC based Macs running earlier versions of OS X up to OS X 10.6.

System requirements | Lightroom

You'll have to pay to upgrade to Lightroom 5

Products

or get the Creative Cloud Photography Plan.

Creative Cloud pricing and membership plans | Adobe Creative Cloud