I had to set my Asus pc running WIndows 7sp1 64 bit back to factory. I am using Internet Explorer 11. I am using Adobe Reader 11. I am using Silverlight 64bit version 5.1.3. Now when I select Acrobat.com I get a message Mandatory Update Available. Will not let me close it. So I select download now. I get a download error "There was an error downloading the update. Error# 16820" I click close and get the message "An Error occurred while installing the mandatory update. The application will now Quit." I select Quit. It goes right back to the Mandatory Update screen. Acrobat.com came installed on the computer and I do not have a serial number. Acrobat.com is listing its version as 2.0.0.0 but I did do some updates and I think I was on version 8 or 9. I went to the Acrobat.com site and it will not let me download an update without the serial number.
What can I do to get Acrobat.com working?