Error "Installation files are not signed”


Error "Installation files are not signed”

Back to "Installation errors"
Latest update: July 21, 2020 ID: 11004

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

This error might be caused by a malicious program that adds certificates of the protection solutions to the Untrusted Certificates folder. This prevents anti-virus programs from installing and launching.

Follow the steps below to solve the issue.


Step 1. Remove malware from your computer


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


Step 3. Check the digital signature of the installer


Step 4. Check the system date on your computer


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


Step 6. Contact Technical Support

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