So, I have subscribtion that is active till aprill 2017 via coupon. Today I bought a 1 year more (Black friday offer). There is no possibility to add any codes to my vpn client due to fact it is active. What to do?
You cannot take the new subscription into use on your device until 30 days before the expiry of the current subscription on them. Since you have the current subscription valid until April 2017, you can only take the new license into use within 30 days of the current expiry date.