That depends on where you live... not all countries allow you to buy direct... with ZERO country information, nobody can answer your question... what happens when you try to buy direct from Adobe?
http://helpx.adobe.com/creative-cloud/help/install-apps.html to install or uninstall
Cloud Getting Started https://helpx.adobe.com/creative-cloud.html
Cloud Plans https://creative.adobe.com/plans
-and subscription terms http://www.adobe.com/misc/subscription_terms.html