Error: This patch package could not be opened. Contact the application vendor to verify that this is a valid Windows Installer patch package
When attempting to install a service pack for ArcGIS Desktop, the following error is encountered:
"This patch package could not be opened. Contact the application vendor to verify that this is a valid Windows Installer patch package."
This error can be caused by one or more system conflicts.
Solution or Workaround
The following is a list of the most common solutions for this error.
Special characters in directory names containing the service pack file, such as ' `, can prohibit it from running. To avoid this, copy the service pack installation file to the root C: drive and attempt the installation from that location.
Update the Windows Installer to the latest version. The download link for the Windows Installer is below in Related Information.
Install the service pack from the command line. Navigate to Start > Run. Type CMD. Click OK. Type the following command and press Enter: