I've found that official Google webtoolkit
download is broken.Many users reported it but google code admin's refuse to admit that it is not broken.The download fails after the 20% or lower.
When the ticket related to this problem was made,admins replied with" You can use the downlaod manager or better internet connection,files are ok and they can be downloaded,there is no problem from our side".
Many users reported that they have connection of about 512kbps-2mbps and are in US or another part of globe using download manager but still download is browken.
After about 2 months of constant complaints still google is not able to fix this problem.
Check it out yourself: http://code.google.com
What could be the matter?
 Google don't care for this?
 There is problem with rest of the world's internet connection who's downloading?
 Or google's server are busy with the requests? and google don't want to mirror the google code site?
Just drop in your replies.