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Open the Dr.Web application; click on Menu → License → Enter a new serial number. Enter your serial number and click on Activate.
No additional actions, including reinstallation, are required. This same method can be used to activate a serial number for a purchase/renewal of Dr.Web Security Space that comes with a free mobile version.
If any error messages appear, try to activate your license using a different network connection.
If you continue to encounter problems, a detailed diagnostic is required. Submit a written request to our technical support service. Please attach the error screenshot to your request, and enter your serial number.