The number 30 is the most ambiguous part. It could refer to:
To understand why a tool like the one found at bit.ly googleinstaller 30 is necessary, we must first understand the fragmentation of the Android operating system. Android is open-source, meaning anyone can use the base code. However, the suite of apps we associate with Android—Google Maps, the Play Store, Google Drive—is proprietary. bit.ly googleinstaller 30
Your phone will ask for permission for each individual service (Play Services, Framework, etc.). You must allow each one for the Play Store to work correctly. The number 30 is the most ambiguous part