You can install Rivyo product review app in 2 ways.
2. Manually install.
1. Auto install --> When you go to app admin you will see "Documentation" on the right top corner. If you click on it you will see the options. Click on "Auto install" and app will get successfully added to your theme.
2. Manual install--> If you want to manually set up the code in your theme then Click here. This documentation will help you to fix the app in your store.