Te Adobe Id that you are using is fro a Trial ( as the button next to the application show try not install ) , Trial is only available for the most recent version via Creative Cloud Desktop Application.
If you sing in wit ha adobe Id that has the subscription then only would you be able to see the option for downloading previous version of the applications. if you have subscribed to creative cloud you can try signing out and signing back in
Regards,
Ankit Kanwara