Error "Installation files are not signed"


Error "Installation files are not signed"

Back to "Installation errors"
Latest update: January 09, 2020 ID: 11004

When installing a Kaspersky application, you may receive the "Installation files are not signed" error message.

This error might be caused by a malicious program installed on the device. Malicious programs install certificates of the protection solutions to the Untrusted Certificates folder. This prevents protection solutions from installing and launching.

Follow the steps below to solve the issue.


1. Remove malware from your computer


2. Check if there are any Kaspersky certificates in the Untrusted Certificates folder


3. Check the digital signature of the installer


4. Check the system date on your computer


5. Define Software Restrictions Policies settings (Windows XP/Vista)


6. Contact technical support

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