PSE6/Mac says I have an invalid SN

Background:
Mac OS 10.5.7
I downloaded and installed the trial version of Photoshop Elements 6 for Mac. 
The program start-up screen advised the 30-day trial is over and prompts me to enter a serial number.
After the 30-day trial, I bought a copy from a computer store.
Program advises the serial number is invalid.  I'm certain I input it correctly - trying both the numeric pad and the number keys at the top of the keyboard.
Do I need to uninstall the downloaded version? If so, how does one do that on a Mac?
The PSE6 program's Readme says, " To uninstall Photoshop Elements 6, you MUST USE THE INSTALLER'S UNINSTALL OPTION; do not drag the program to the trash to uninstall it."
But, how could I do that if the product won't start?

Despite what adobe says, you can't use the serial number from a boxed version in the trial. You will need to uninstall the trial and install from the disc. You don't need to run PSE to uninstall it: If you saved the trial download, launch the installer and choose Remove components rather than Install.
If you didn't save the trial there may be an uninstaller in Applications>utilities.

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