Hello, I think this article might help you [[http://mzl.la/1AhSIKN|Use the Adobe Reader plugin to view or download PDF files]] .

The latest major update to Adobe Acrobat XI updated the Create PDF extension with the necessary signature to pass verification. Could you try updating as follows: Within Adobe Acrobat: Help menu > Check for Updates If you can't update that way, there is a ''huge'' download on the release notes page here: * Quarterly "catch-up" (cumulative) updater: http://www.adobe.com/devnet-docs/acrobatetk/tools/ReleaseNotes/11/11.0.14.html (230 MB) And then you can grab: * Security patch for 11.0.14: http://www.adobe.com/devnet-docs/acrobatetk/tools/ReleaseNotes/11/11.0.15.html (17.6 MB)