10.1.16 was an important late security/maintenance update for Acrobat X Pro that helped reduce immediate risk for users who could not upgrade; however, continued use of Acrobat X remains risky and upgrading to a supported Acrobat release is the safer long-term path.
A notable resolution includes fixing an error message that appeared when opening PDFs signed using EchoSign. Adobe Acrobat X Pro Update 10.1.16 Download