Lightroom 5 will not open

Hello all,
I have an iMac, OS 10.7
I installed Lightroom 5, using the 30-day trial and it ran fine for 30 days - I used it almost daily.
After 30 days I purchased LR5 via the Adobe web site and received an email with the serial ID.  At the registration page, I filled in all nformation and could not proceed further.  The "Next" button was not selectable.  The only option was "Finish" or "Back".  I select "Finish" and it just closes.  Repeating all previous steps has the same result.
I called Adobe CS and they confirmed the product is registered.  He told me I had to download LR again because it was not installed on my machine.  I did not understand how I could use the program for 30 days if it was not installed on my machine.  He could not explain it and just repeated himself a few times.  I downloaded and installed it again with the same result as above.
Please help!

Hi All,
This issue is reporeted in Mac Lion and Mountain Lion mostly.
When you open the serial number window, Enter the serial number and click Finish. LR5 doesn't open and nothing happens.
If this is the case,
Please navigate to Mac HD> Library> Application support> Adobe> Lightroom folder.
Delete the Lightroom 5 registration file from the folder.
Then open the serial number window again and enter the SN.
The issue should be fixed.
Thanks and Regards,
Dipanjan Das
Bangalore, India

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