@onkt. If you have purchased the newest version, you will have access to version 3.1.9. You can’t get free access to version 3.x from your previous purchase of version 2.7. You will have to purchase the current major version, to get get free updates of minor and maintenance releases.
However, as a previous customer, you are afforded a discount on the purchase of the current major release. Please send me an email to support[at]valorapps[dot]com with a the order number of your previous purchase, and I will give you a 30% discount coupon.