I am trying to install Photoshop Elements on my new Windows 8 computer (I recently upgraded my windows 7 computer where Photoshop was working fine on before).  It says the serial number is invalid.  Do older versionsnot work on Windows8, or do I need to u

I am trying to install Photoshop Elements on my new Windows 8 computer (I recently upgraded my windows 7 computer where Photoshop was working fine on before).  It says the serial number is invalid.  Do older versionsnot work on Windows8, or do I need to uninstall it from my old computer first?

You are allowed to have two activated installations.  If you happened to have one on this Windows 8 machine before, it is possible that the activation used for it was never deactivated (did you deactivate it before you upgraded Windows?).  Talk to Adobe support thru chat.  They might be able to resolve this with you:
Serial number and activation chat support (non-CC)
http://helpx.adobe.com/x-productkb/global/service1.html ( http://adobe.ly/1aYjbSC )

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