On the Edit menu, navigate to Preferences by clicking it (or you can press Ctrl + K).

To manually update the AATL, launch your Adobe Acrobat Reader DC and click the Edit button as shown in the diagram below.Note: In this example, Adobe Acrobat Reader DC is being used, but the guidelines applies to all Adobe Acrobat Reader versions. Note: The Adobe Acrobat Reader will only automatically update the trust list within 14 days of the previous update check, and the update check is triggered by the opening of a signed PDF file. If this is not the solution you are looking for, please search for the solution in the search bar above. This article will walk you through the process of manually updating the Adobe Approved Trust List (AATL) in Adobe Acrobat Reader. How to Manually Update the Adobe Approved Trust List (AATL) in Adobe Acrobat Reader Introduction How to Manually Update the Adobe Approved Trust List (AATL) in Adobe Acrobat Reader