Adobe Reader XI reached end-of-life of on 15 October 2017. [0] It has not received security updates for nearly five years. Security updates are very important

Adobe Reader XI reached end-of-life of on 15 October 2017. [0] It has not received security updates for nearly five years. Security updates are very important for a PDF reader, particularly Adobe's. [1] I would advise you not to use it, unless it is to open trusted PDF files you created yourself. [0] https://helpx.adobe.com/acrobat/kb/end-of-support-acrobat-xi-reader-xi.html https://helpx.adobe.com/acrobat/kb/end-of-support-acrobat-xi... [1] https://www.cvedetails.com/vulnerability-list/vendor_id-53/product_id-497/Adobe-Acrobat-Reader.html https://www.cvedetails.com/vulnerability-list/vendor_id-53/p...