We recently published a guide about how to download the EV installation software and license keys which should hopefully answer all the questions you might have about obtaining license keys & installation media. This also includes how to obtain service packs for current & previous releases.
The purpose of this guide is to discuss the different aspects that you need to consider during sizing and recommend best practices for implementation. With V8 there are some new issues for you to consider when rolling out DA so make sure you download this document and start discovering more about DA V8.0.