I lost my Dr.Web license. How can I recover a license purchased through Google Play
If your license has expired, you will not be able to restore it. Please purchase a new license.
If your license is still valid, open the application menu (the button with the three dots in the top-right corner of the screen); select License, then — I already have a license, and select Recover a purchase on Google Play. To activate the license, you must have Internet access and use the same Google account you used to make the purchase.