Clear your launcher data or reboot. If still missing, install a third-party launcher like Nova Launcher (Android 5.1 compatible).
Transfer Complete.
For some users, using a Google Installer tool designed specifically for Android 5.1 and 6.0 can be a more reliable way to install the entire suite of necessary services (Framework, Account Manager, and Play Store) at once. Where to Download (Trusted Sources) google play store apk link download for android 51