Cannot purchase offer Kurviger Tourer+

Cannot purchase offer.

I have “old” Kurviger Pro app. Please help.

(Debug information, this helps us helping you, you can remove this if you don’t want to share this data, it should not contain any personal or sensitive information)
Device: Blackview - A80Pro - Android: 9 - WebView: 115.0.5790.166
App-Version: 3.1.0 - 1331
Screen: 320 x 694 px - 2.25dppx

You can purchase Tourer+ on the website
The app is on Google Play and there should be a purchase option too.

The new Kurviger 3.x app can be installed parallel to the old Kurviger Pro 1.x, so you do not need to delete K1.

What does not work for you?
Do you get any error messages?

Thx. I have already got the new app, but when I want to buy / unlock tourer+, I get a code 6777001.

Problem solved. Deleted and reinstalled app.