The download time for Addictive Drums is very, very slow -- stupidly slow, actually.
How slow, you ask? 2.75 hours for a 1.3 GB library...and that's on a fast (broadband cable) Internet connection. You have to use XLN's Online Installer application, which manages all licenses, downloads, and updates. It's a convenient interface but ohmygawd it's SLLLOOOOWWWWWW. Just be aware that you can't use an efficient download manager (such as Speed Download, which would be way more cool), so you're in for a loooonnnggg download process using the Online Installer.