The update problem of iTunes

The current version of my macbook air is macOS Catalina ver.10.15.7.

While my iTunes version is 1.0.6.10, I guess this is not the latest version of iTunes, as one of my software shows that it is not, and keep asking me to update.

However it doesn't appear the option to update iTunes on App Store, what can I do, so that my iTunes can update to 12.8?

Please help!!! That's super important to me!!! :(