I am trying to download and install the update for Acrobat 9.5.1. I have downloaded AcrobatUpd951_all_incr (2).msp. When I click on Install, I receive the a dialogue box "Do you want to open this file?" The box states "Unknown Publisher." and "Windows Installer Patch." When I click on Install, I receive the following message: Windows Installer: "This patch package could not be opened. Contact the application vendor to verify that this is a valid Windows Installer patch package."
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