Hi I would like to share with you with this great link if you don't know it yet
As you probably know not all apps from Google playstore are compatible with banana pi android system
So what you need to do is to download apk file and install it manually.
This is easiest way.
1. Copy google play link to app you want to download
2. Past it in link abow
3. Click generate link
4. Click Download apk
5. Install apk file from sdcard
What is quite odd It let me somehow download payed version of Ttorrent for free.