Cant install Itunes

I have installed the latest version of MacOS Catalina 10.15.6, downloaded the Itunes latest version: 12.8 (if this is not the latest one, I dont know where to get the newest, in this link is the only one that appears: https://www.apple.com/itunes/)

I am trying to install it and an error pops: This actualization requires version 10.13.99 or previous from macOS.

HELP please :(