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To get 150 extra days added to the term of your license, the following conditions must be met:
The second license can be registered either while the first license is still valid or after it has expired.
Click on the Dr.Web spider icon in the notification area. In the pop-up menu select License.
The menu that appears while the license is still valid
The menu that appears after the license has expired
If you previously registered a license and it is still valid, its serial number will appear in the License Manager.
In the subsequent License Manager window click the Buy or activate new license button.
The Registration Wizard dialogue will open. Enter a new serial number.
In the next dialogue that opens, select I will specify the previous license.
In the newly appeared window, enter the serial number or specify the location of the key file associated with the previous license.
By default, you are prompted to enter the serial number, but you can also specify the key file's location.
Fill out the registration form, and click Next.
The License Manager window will open.
Once you have registered a new serial number: