When trying to update Acrobat, and after manually downloading Adobe AIR from adobe.com in order to start the download, the update failed with an Error# 16820. Can you please advise what this error is and how I can fix it? Thanks
Sounds like you have the Acrobat.com desktop (AIR) application installed. This application is no longer supported. I would suggest you uninstall it and simply use the web interface (http://acrobat.com) moving forward.
Sorry for the inconvenience.