Your individual license lets you install your Adobe app on more than one computer, sign in (activate) on two, but use it on only one computer at a time.
If you need to sign out of an app so you can use it on another computer, open the app, then select either:
For more information, see Sign in to activate your Adobe apps.
If you can't access your old computer (or the hard disk crashed), you can sign out of your app from the account management page. Once signed out, you can sign in to the app on another computer.