For the latest system requirements, see http://www.adobe.com/go/illustrator_systemreqs.
For a list of the latest system requirements for other Creative Cloud products, see http://www.adobe.com/products/creativecloud/tech-specs.html#requirements.
Creative Cloud trials are "try and buy", allowing you to evaluate individual products or editions and then convert the installed trial to a full version. You can convert from a trial to a full version at any time by signing up for a subscription. If you purchase a subscription, you are required to be online and to log in with an Adobe ID to start using your full version.
Adobe's single user license allows installation of a single product license on two machines (such as one work machine and one home machine) provided the software is used by the same individual and not concurrently on both machines.
If you want to install the product on a third computer, you must first deactivate the software on one computer. To deactivate, choose Help > Sign Out.
New features and enhancements are listed and described in the new features summary page.
For general Adobe Community, visit https://community.adobe.com.
To find help on topics related to downloading, installing, and getting started with your software visit http://community.adobe.com/t5/get-started/bd-p/get-started?page=1&sort=latest_replies&filter=all.
For product help plus community-based instruction, inspiration, and support visit http://www.adobe.com/go/learn_Illustrator_support_en.
For Adobe Customer Care, visit http://www.adobe.com/go/customer_support, which provides assistance with product information, sales, registration, and other issues.
Outside of North America, visit http://www.adobe.com/go/intlsupport/, click on the drop-down menu under the question "Need a different country or region?", choose a different country or region, and then click GO.