Installation files are not signed


Kaspersky Free


Installation files are not signed

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Latest update: October 04, 2017 ID: 13816

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

Malware can cause this error by installing anti-virus products’ certificates in the Untrusted Certificate repository. This prevents anti-virus programs from installing and launching.


Check for Kaspersky Lab certificates in the Untrusted Certificates folder


Check the digital signature of the installer


Check the system date on your computer


Define Software Restrictions Policies settings (Windows XP/Vista)

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