While trying to install Webroot, you get a message saying "Windows cannot verify the digital signature for this file."

Created by Amir Affifuddin Amir Shariffuddin, Modified on Thu, 29 Sep, 2022 at 9:22 AM by Amir Affifuddin Amir Shariffuddin

Problem Explanation


To keep up with security requirements, the Webroot agent is signed with a SHA-256 cert. You will face this issue if your server does not support these new certs. You must patch your servers before you can install the Webroot agent.


Windows Windows 7 SP1 and Windows Server 2008 R2 SP1

The following required updates must be installed and then the device restarted before installing any update released August 13, 2019 or later. The required updates can be installed in any order and do not need to be reinstalled, unless there is a new version of the required update.
  • Servicing stack update (SSU) (KB4490628). If you use Windows Update, the required SSU will be offered to you automatically. 
  • SHA-2 update (KB4474419) released September 10, 2019. If you use Windows Update, the required SHA-2 update will be offered to you automatically.

Important You must restart your device after installing all the required updates, before installing any Monthly Rollup, Security-only update, Preview of Monthly Rollup, or standalone update.

Windows Server 2008 SP2

The following updates must be installed and then the device restarted before installing any Rollup released September 10, 2019 or later. The required updates can be installed in any order and do not need to be reinstalled, unless there is a new version of the required update.

  • Servicing stack update (SSU) (KB4493730). If you use Windows Update, the required SSU update will be offered to you automatically. 
  • The latest SHA-2 update (KB4474419) released September 10, 2019. If you use Windows Update, the required SHA-2 update will be offered to you automatically.

Important You must restart your device after installing all the required updates, before installing any Monthly Rollup, Security-only update, Preview of Monthly Rollup, or standalone update.

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