I have an old version of Adobe Acrobat 6 that is really not running well on my newer systems. I did a nono by buying a copy of Adobe Acrobat XI Pro on EBay. Product looked fine, but once installed, serial number was ruled invalid, and Adobe did not want to elaborate at all. Basically disconnected me in the middle of the chat. I do not have a bunch of money to buy newest Adobe Acrobat, but would like to create signable contracts on my system to use on a laptop to sign people up to my new service company. Just curious as to a way to make the version of XI I have work? Or buy an older version that will work with newer OS. Thank you for reading, and please advise if you have a solution for me. LT 🙁