To ensure you are running the definitive version, check your game version on the Switch Home Screen by pressing the button. Base Version : 1.0.0
If your Switch is connected to the internet and not modded, you can update directly through official channels: Automatic Updates: Ensure "Automatic Software Downloads" is System Settings > System Manual Update: Highlight the icon on the Home Menu. button to open Software Update > Via the Internet Verification: Clannad Switch ROM NSP UPDATE