Adobe Acrobat Reader XI (version 11) is no longer supported by Adobe as of October 15, 2017. While you can still technically find and download version 11.0.12, Adobe strongly recommends against it because it no longer receives security updates, leaving your system vulnerable to malware or exploits. Quick Download Guide
Enhanced Commenting: Tools for adding stamps, file attachments, and audio recordings directly to PDFs.
Apply 11.0.12 Update: Use the manual update mechanism within the app or download the specific .msp update file from the Adobe Release Notes. Adobe Reader XI Version 11.0.23 | Community
Suddenly, his phone buzzed. A notification from his banking app: Large purchase authorized at Electronic Mart. Then another: Password changed for Google Account.
If you need a free PDF reader that works on older PCs without security risks, consider:
Adobe Acrobat Reader XI (v11.0.12) is a legacy version of the standard PDF viewing software developed by Adobe Systems Incorporated