(adsbygoogle = window.adsbygoogle || []).push({}); i am wanting to do that free app purchase, but my nexus 7 google play updated, i am rooted and want to know if there are anyways i can bypass it to downgrade back to the old google play

Freeze the market updater using Titanium Backup or something that can freeze apps.
Remove the current market APK you have installed.
Download an old market APK.
Install the old one.

Thanksssssss