Adobe now controls all software installation; this includes when you need to reinstall software due to a new PC or other issues. They required a separate account (username and password) that they manage.
Login with your Adobe Enterprise ID (firstname.lastname@example.org). You must be signed in with your Enterprise ID (not Adobe ID) for this link to work.
You can have a regular Adobe ID using your email@example.com; you must click the Enterprise ID link.
You will need your Adobe Enterprise ID password, reset your password if you don't know this.
Install Adobe Acrobat Pro.
Start Adobe Acrobat Pro, login with your Enterprise ID.