Google Installer is an app you should only use if you have a Xiaomi Android device without any of these Google apps.
Once all these apps are installed, you can start using the Google Play Store. To do this, the app will help you to conveniently download and install the following apps: Google Services Framework, Google Account Management, Google Play Services, and Google Calendar Synchronization. Google Installer is an app that allows you to install the Google Play Store on a Xiaomi device easily.