to install Google Assistant on Moto G4 plus
STEP 1: go to Language preferences add or make English (United states ) to the top.
Step 2: go to setting and then apps and then find Google play services then on up right corner you’ll see three dotes touch on it and the hit UNINSTALL UPDATES and do the same with “GOOGLE APP” also.
STEP 3: restart the phone (AFTER RESTARTING) Don’t UPDATE THE Google play service and Google app directly. Because you have to be BETA TESTER for both the apps. become BETA tester for both app and the update them
For both Google and Google play services