I have a valid serial number, but acrobat installer won't accept it

I'm trying to install acrobat 8.1 on a new computer. I found my serial number under my account and it matches the one on the working acrobat v8.1 on my old computer, but then trying to run the installer,I get the message the the serial number is not valid. What is going om?
I have a screen shot showing the serial number on my adobe and the exact same serial number shown as invalid on the installer.
Thanks,
Gary

This acrobat is the v8.1 full product downloaded from http://helpx.adobe.com/acrobat/kb/acrobat-8-9-product-downloads.html. My Adobe says that I have a registered version of Adobe Acrobat, but does not specify a version number. The Acrobat on my old computer is 8.1 and displays 20 characters of the serial number. The serial number shown in My Adobe has 24 characters and the first 20 match what is shown on the old computer. Do I need to uninstall from the old computer before I can reinstall on the new one?
Thanks,
Gary

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