They're also offering a free upgrade to the paid version for the first week, but you need to get it this week. From the blogpost on reddit "Current Pro users,

They're also offering a free upgrade to the paid version for the first week, but you need to get it this week. From the blogpost on reddit "Current Pro users, please make sure to get the new Pro upgrade now (free for one week). Unfortunately, due to the limits of the app transfer system, we have no other way to verify, credit, or transfer your old Pro account."