Hello. Plugin cost is 33$. I have tryied several times to apply 19$ coupon "NewYear2019" for buying plugin WP Quiz Pro but coupon is not working. It doesn´t apply and not change 33$ to 19$. I have tryied at least 15 times in the las 3 days but i can´t apply this coupon. Can you please help me?. I want to buy WP Quiz Pro. Thanks