Why won't my Lightroom 4 open up for use after I successfully downloaded and installed it?

I just followed all the instructions for downloading and installing Lightroom 4 on my comp. It said it was successful but the icon on my desktop hasn't changed and every time I try to open it to edit pictures it goes back to the installation pop up.
Please Help!!

you are clicking the installation icon again , that why this is happening , the icon doesn't get changed
to open the application go to Mac HD-->Applications--->Adobe lightroom 4 , in this folder you will have the app file to launch the application.

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