You posted this in the Captivate forum, will move it to the Acrobat forum.
Nothing. You'll be throwing your money away. Acrobat X is outdated, unsupported and not compatible with any current operating system.
You should get a subscription to the latest version of Acrobat DC, instead. You can pay for it on a monthly or yearly basis (the latter is cheaper, of course). You can also buy a perpetual license, but that's much more expensive and the updates for it are less frequent.