Hej Emil,
This site has the .apk version, but only v8.2.2 as highest app version. But it’s a start, right?
Oh, and here’s a manual on how to extract the apk file from an installed (homey) app on your phone: Top 5 Ways to Extract APK File of Any App on Your Android Phone - TechWiser
In short: Just install Android File Explorer, press Apps, and long press Homey app and tap ‘Backup’.
