Full ((free)) Adobe Acrobat Xi Pro 11.0.23 Patch -

Using 11.0.23 today is considered a security risk because it has not received any security patches for over eight years, leaving it vulnerable to modern exploits embedded in PDF files. Acrobat XI Pro won't update or stay open - Adobe Community

Originally distributed through the Adobe Enterprise Toolkit and internal update mechanisms. FULL Adobe Acrobat XI Pro 11.0.23 Patch