Adobe website wont allow download their product using regular download mangers. Instead they will pullup a java based download manger. To bypass this create an adobe id and signin to the website. after succesful login paste download url to the address bar

http://trials.adobe.com/akdlm/dlm/Applications/MastCol/CS4/Win/ADBESTAMCS4_LS1.7z

then use flashget / idm watever to download. If the downloading got interrupted dont worry. you have to sign in to web site before resuming the download