Wolfram Desktop gives you the choice to work with Wolfram|One offline on a computer that you are the primary user of.
You are ready to start setting up Wolfram Desktop after downloading its installer and preparing your Wolfram ID and password. Setting up Wolfram Desktop requires installing it and then activating it by signing in with your Wolfram ID credentials:
Setting up Wolfram Desktop on Windows
If your computer is offline, you can activate Wolfram Desktop using your activation key, MathID and password: