How do I update Acrobat Reader so that I can open a .PDF file?
If you have noticed that you cannot open a .pdf file, you probably have an outdated (unsupported) version of Acrobat Reader. The current versions that are supported are Adobe Acrobat Reader XI and Adobe Acrobat Reader DC (the latest version).
Uninstall outdated version of Acrobat Reader
1. Go to Control Panel settings on your PC (or Applications on your MAC)
2. Select Programs and then Uninstall or change a program
3. Select Adobe Acrobat Reader 10 (or any lower numbered version--this picture shows the latest version as of 12/2015)
4. Select Uninstall
When the uninstall is completed, close out of Control Panel.