Why do you pose the question - is there some issue or misunderstanding?
To get Photoshop (the latest version inc Lightroom) you take out a subscription to the Photography Plan - it costs around $10 a month. You download the application to your computer and use it in the normal way (i.e. apart from downloading Photoshop you don't need to be online to use it). Adobe checks periodically that you're up-to-date with your subscription.