As Acrobat X is not compatible Mac High Sierra: Adobe Acrobat system requirements, problems are to be expected. You may try updating Acrobat using "check for updates" option under Help menu, reboot the machine and check if that helps. You may also download the update using this link: Overview — Release Notes for Legacy Acrobat Products
I don't think there are any updates for CS6, when I try to update Adobe Acrobat X Pro, I get the error, "Cannot connect to Adobe update server. Please verify that you are connected to the internet and check for updates again. Error: 1042," which I believe is there error message meaning that there is no way to update this product any longer.
My version number of Adobe Acrobat X Pro is 10.1.16 which I believe is the latest.
When I try to update another CS6 product, such as Dreamweaver, it does connect via Adobe Application Manager but comes back with "Your applications are all up-to-date as checked: less than a minute ago."
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Yes, that's the latest/last update there ever was for Acrobat X. There will be no further changes to support new systems; that's considered a new feature to pay for.