I purchased a license for Adobe Acrobat XI Pro from an ebay seller in late 2013. I installed it on my computer using the serial number obtained from my seller. I have used Acrobat XI Pro successfully for almost 4 years now. Three weeks ago, I purchased a new computer and successfully installed Acrobat XI Pro on my new computer, using the same serial number. I was able to use Acrobat XI Pro with no problem for about a week. Unfortunately, my Windows 10 installation then got corrupted and I had to reinstall the operating system. After that, I again tried to install Acrobat XI Pro using the same serial number, but it would not allow the installation, saying "the serial number you entered is invalid. Please try again with a valid serial number." Being unable to install the licensed version, I installed it under the "free trial." It works (for now), but it still will not accept my serial number as valid. I believe, from Adobe's web site, that I can install Acrobat XI Pro on two computers, but can only use it on one at a time. However, I am not able to even install the licensed version on my new, second, computer. When I chatted with Adobe "technical support," all he could say is that my serial number was "invalid" and that I should contact my seller (who is long gone from ebay) or ebay (what would ebay do, since my original purchase was perfectly handled?). He could not explain why a serial number that worked fine to install Acrobat XI Pro on my new computer a week ago is no longer a "valid" serial number only that my serial number is "invalid." Do you have any idea why I cannot install using this serial number? My (unprofessional) speculation is that Adobe feels my license is already installed on two computers (my old computer, which still runs the licensed Acrobat XI Pro) and my new computer (before the OS reinstallation). After the OS reinstallation, I have no way of "uninstalling" or "deactivating" the original installation on my new computer. I am willing to deactivate and/or even uninstall Acrobat from my old computer if that would permit me to install it on the new computer. But, I am concerned that if I do that, I will lose the ability to install Acrobat on either computer (since my serial number is "invalid"). Is this a valid concern? Will uninstalling Acrobat on my old computer permit me to install it on my new computer? Any advice or assistance you can provide would be very much appreciated. Thank you, in advance, for any suggestions.
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