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You were probably using the 30-day trial, which is available without registering on Doctor Web's site. Users of this trial version are not eligible for any discounts toward the purchase of a commercial license.
However, you can get a renewal discount if you register for a 90-day trial license via our website and get a new serial number. Since customers can only use one trial key of any type within the course of one year, you will not be able to activate the trial key via the program, but you will be able to indicate it so that you can receive a renewal discount. To have the discount applied to your license purchase (follow this link), specify the serial number of your 90-day trial in the Your Dr.Web serial number section as the basis for your renewal, and you will get a 40% discount.