Rooted, and patched through Lucky and still can't install unsigned app.
OBB you uploaded it's basic, game needs to download another 200mb update.
When I tried with signed app, and obb, game gives me a information about background software, and there's no option to play bc I had to close it.
#Edit
So if you can update unsigned apk it will be fine, I don't want waste my money anymore to get stupid coins or gold.