To the problem with the android v0.7.8.1 not installing on previous: When I debug the app, I saw I made a grave error. Explanation below but basically you guys will have to uninstall previous and start fresh.
What happened:
Recently my HDD went to shit, at the time I didn't have the android key backup. Even though I did not sign the game/apk, android studio does this by default base on the sdk that was used. This is auto generated.
So now because of the fresh android install on the new SSD, the new key conflicts with the old package key. Thats why it cannot install and giving error.
I'm truly sorry for this problem.
I have since then added key location to my backup suite so this wouldn't happen again.