Can't update License or login on iPhone

I’m stuck and tried everything.
If I login to missions on the web interface, everything is there. I can’t find my missions on the IOS app.

If I try to export on the web I receive a message that I need a valid license.

How do I update/pay for my account?

Thank you

Looks like you were using the iOS Beta version. This is no longer supported so you have to buy Litchi from the Apple’s app store.

Thank you for taking the time to reply. I was using the beta version yes. And, I am happy to pay for the app again, however, when I go to the iOS store, there’s no option to pay for it. I can only download it.

How can I pay and upgrade my license? Thank you.