I think you need to activate the product key in uconnect.
In your Steam library, right click on the game, Manage or Admin, there it will show you the product key, copy it, and you have to register the key in Uconnect. If it is already downloaded on Steam, Uconnect will not ask you to download it.
If Steam does not recognize it as downloaded, even though you have it on your hard drive, it is because it was somehow uninstalled (many times Steam does not delete it when it is uninstalled), you will have to install it again.
