Use APKPure App
Get AvNavXwalk Runtime old version APK for Android
Runtime for the AvNav app - based on the crosswalk project
This app is a crosswalk runtime (https://crosswalk-project.org/) for the AvNav navigation app https://play.google.com/apps/de.wellenvogel.avnav.main
Normally this app will be downloaded from within the AvNav app.
But you can download it by hand from here.