You can find documentation and potential patch links on the Adobe Release Notes for 11.0.23 .
: Allows users to sign documents electronically or send them to others for signing via EchoSign integration. download adobe reader xi 11.0.23 offline installer
Adobe Reader XI (version 11.0.23) is a legacy product that reached its on October 15, 2017 . This means Adobe no longer provides security updates, technical support, or direct official download links for this specific version on its main consumer site. Availability & Risk Assessment You can find documentation and potential patch links