If, at the moment of infection, you had a valid commercial Dr.Web license and the current version of Dr.Web Enterprise Security Suite/Dr.Web Desktop Security Suite/Dr.Web Security Space was installed, you are entitled to free decryption if it is possible. You can check whether your version is current in the Download Wizard by entering your serial number: the first version in the newly appeared list is the current one.
You are welcome to submit a request via the form.
You can find the list of reasons why Doctor Web may decline requests for free data recovery here.