Pro Upgrade doesn't work

Whenever I push the upgrade button I geht a failure message (see attached file).
My device: Honor 8 with Android 7.0
How can I buy the Pro version directly?

Already checked the store ?

Which store? I installed and reinstalled AMS from the playstore. To get the pro version I have to install the free version and then - failure again.

Hi, see: https://www.avast.com/faq.php?article=AVKB64

Hi, thank you - but it is already the second step (tap on upgrade button) which is simply not working.

Hmmm, best you wait for Tereza…

Hi, this issue should be fixed for the upcoming version 6.3, which has already been available in Beta version (more on https://goo.gl/5AVSFJ), public release will follow in a few days.