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Outlook add-in installer fails with an error code 2869

When

When installing Pronestor Outlook add-in, the installer fails with the following message:

"The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 2869"

 

Why

It can either due to:

  • Two versions of Outlook has been installed on same PC
  • Lack of permissions to run and install installation packages
  • Ensure that you run the latest add-in (known issue for older installation packages)

 

How to solve

  • Make sure only one version of Outlook is installed and running on the PC (re-start PC after uninstall of duplicate Outlook)
  • Open a command prompt with administrator permissions, and run the installer from within this command prompt
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