I'll guess you mean "when I try to INSTALL new version" you get the 1606 error.
To fix the 1606 error, see the discussion about it in the links below. Please recognize that although I've given you the two most probable fixes to your issues, the 1606 Error may involve some registry tinkering.. If you're not comfortable editing the registry, and making a backup of the registry before doing so, you'll probably need someone qualified to help you at your location.:
First, try the "Fixit" button in the link below:
If that doesn't take care of the issue, then follow these instructions:
After performing the 1606 fix, then download the newest, full, offline installer of Adobe Reader from the link below and once it's on your desktop, close your browser windows and double click the file to install it.:
Hope this helps.
I uninstalled Adobe Reader 8.5 - now when I try to download new version, I get "Error 1606 no APPDATA"
How do I recover original program??