I am trying to install a registered copy of Photoshop Lightroom that I never installed on my Apple iMac with software version 10.10.  I get the message "Adobe Lightroom 1.  Cannot be installed on this disk because a newer version of this software already

I am trying to install a registered copy of Photoshop Lightroom that I never installed on my Apple iMac with software version 10.10.
I get the message “Adobe Lightroom 1.  Cannot be installed on this disk because a newer version of this software already exists on this disk”
If it is here – I cannot find it anywhere, and I don’t believe that I ever installed it.
I have ordered the upgrade to Lightroom 5.0 and figured that I should install Lightroom 1.0 first.
How can I solve this problem

Actually when LR 5 starts for the first time after it is installed it will have a dialog to Buy, Try or Enter a serial number. You select Enter a serial number and enter the LR 5 serial number first and then because it is an upgrade serial number it will ask for the serial number of a Previous version. You then enter the LR 1 serial number.

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