For information on downloading Edge Animate 1.5, see http://forums.adobe.com/message/5745316
Edge Animate CC is the cloud version of Edge Animate, and will continue to have perioidic updates. With every new update, there will be new features, and bug fixes for previous updates.
In addition to what Preran said, you can also purchase just Animate through the single product purchase as a part of the Creative Cloud offerings:
Please note that while Edge Animate 1.5 is free under a perpetual license, the browsers move fairly quickly and your content may not work on all modern browsers.
Seriously Adobe, how do you buy Edge Animate?!
It is part of a cloud package.
You cannot buy Animate only. It is part of most packages.