I just bought 4.2 from App Store, am I unable to update to 5?

My AppleTV app won’t update to Infuse5 and under a month ago I bought version 4 and paid 10€ for that. Do I now have to pay 14€ extra for version 5?

If you purchased v4 recently you can upgrade to v5 for free.

More info on how this works can be found here. Upgrade to Infuse 5 and save 30%