In some cases in order to activate Kaspersky Internet Security 2013 you will need to perform it using a key file, received from Kaspersky Lab Technical Support.
In order to activate the application by a key file, perform the following actions:
Release of antivirus database updates (required to protect your computer/server/mobile device)
Providing technical support over phone / web
Release of patches for the application (addressing detected bugs)
*Installation under Windows 8.1 is not supported by the current version.
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