Google Account — Manager 6.0 1 ((link))

What is Google Account Manager?

Alternatively, install a compatible GApps package for your ROM via recovery (OpenGApps, MindTheGapps, etc.) which usually includes the correct Account Manager and supporting services.

8. Upgrade / Migration Path

Install

: Open the APK file. Tap "Install". If you see a message "App not installed" because of a conflicting package, you cannot install it over the existing system app without root access.