How do I install iTunes onto my Mac?

I have been onto the apple website and tried to install the two versions of iTunes available and yet I keep getting a message saying that I don't have the right version to download iTunes when I try to install.

I have just updated my Mac prior to trying to install either of these versions.

I have a MacBook Air Catalina

Version 10.15.4

Any ideas on how I can go about installing iTunes onto my Mac as I need to sort out my iCloud.

Thanks in advance.

Millie