Trying to uninstall Reader 8.1.1 in order to update to version 9 but message appears 'This patch package could not be opened.Verify that the patch package exists and that you can access it, or contact the application vendor to verify that this is a valid Windows Installer patch package'
I would previously have downloaded 8.1.1 at the request of a bone fide sender in order to read the info. I now need version 9 in order to access a newly sent Bank savings account form but 8.1.1 has to be uninstalled first.
I use Windows system.
Desperately need help - absolutely stuck