Step #1: Open the ‘Settings’ app and tap on the ‘Applications or Apps.
Step #2: Search for ‘Google Play Store’ and tap on it.
Step #3: Now, hit the ‘Clear data’ and Clear cache’ option.
Step #4: Then, head to Accounts option and delete the Google Account.
Step #5: Restart the smartphone and set up the Google Account again;
Step #6: Now, head back to the Google Play Store and try downloading..