Google Installer V2 provides on-screen installation facility to install GAPPS.
GAPPS is a combination of Google apps including Google Play Store, Google Contact Manager, Google Play Service and so on.
MIUI stable ROM comes with Google apps installed. If you flash Global Beta or China Developer ROM, you need to install Google apps again.
The Google Installer V2 works smoothly on all MIUI versions on top of KitKat, Lollipop and Marshmallow ROMs for Installing the minimum Google Apps Base.
After installing Google Apps Base from installer, later you can directly download the required GAPPS from Google Play Store.
Step by step guide to install Google Apps Installer V2 on any Xiaomi phone:
Step 1: First you have to download the installer. Click here to download Google Apps Installer V2.
Step 2: Enable installing from “Unknown source”. Then tap on the downloaded installer. Installing process will begin. You’ll see the following figure. Tap on install.
Step 3: All google Base Apps will be installed one by one. Be patience and wait for completion. The installed version of play store might not be latest so you have to update it later.