The error "Activation code is invalid for this region" occurs if you attempt to active the application with an activation code that was intended for use in another country or region. For example, you may have gotten this error if you bought Kaspersky Internet Security in your home country and then tried to activate it while abroad.

Solution

To avoid this error, activate the product in the country you purchased it in.

This error can also occur if Secure Connection is enabled in Kaspersky Secure Connection. Disable Secure Connection and try to activate the application again.

What to do if the solution didn't help

Follow the instructions below if:

The error persists even though you activated the application in the same country where you purchased the code.
You cannot activate the application in the country where you purchased the code for some reason (e.g. due to move to another country).

Submit a request with a detailed description of the issue to Kaspersky technical support:

Via My Kaspersky for Kaspersky Internet Security, Kaspersky Anti-Virus, and Kaspersky Total Security. See the Online Help page for instructions.
Via the Kaspersky Small Office Security Management Console for Kaspersky Small Office Security. See the Online Help page for instructions.

Please provide the following information in your request:

Region where you tried to activate the product
Activation time and date
Activation code of 20 symbols (four groups of five characters)
Detailed description of the issue
IP address of the computer on which the product is installed. To find out your IP address, you can use one of these services.
Your Internet service provider
A screenshot of the main application window of the product you tried to activate. See this article for instructions.