I have Apple TV Model 1469 I had CBS All Access which is now Paramount how do I download the Paramount APP????

Apple TV (3rd generation) does not support user-loading of new (third party) apps. Unfortunately, that means that your old device is no longer supported for this new (non-Apple-TV-app) service.

Apple TV - Supported devices - Paramount+ Help Center

It was said that Apple TV app Channel ‘CBS’/‘Paramount’ was to stay available as Channel, but those announcements were several weeks ago. I haven’t seen a confirmation, in particular relating to the 3rd generation.