Being notified that my product key is invalid

I just received Acrobat 12 with another product that I purchased; so I uninstalled Acrobat 9 Extended from my desktop and am now trying to install it on my laptop. During the installation where it ask for a product key, it keeps telling me that the key is invalid. I have the key copied to a drive at home and it is the same key that is listed for the product online under my account. I need assistance getting this problem fixed so that I complete the install. I thought that the key was available for install on two machines as well; which would mean that this key is altogether blown. Please help.