you can't download patents that are too large directly fromespacenet.com, so i used IDM for downloading each page of the patent independently than i could combine it at single pdf file.

Download IDM from here:

http://rapidshare.com/files/171224942/IDM_5.15.rar

open the patent page you would like to download for example:

http://v3.espacenet.com/publicationDetails/originalDocument?CC=WO&NR=2009042455A2&KC=A2&FT=D& date=20090402&DB=EPODOC&locale=en_V3

choose maximize from the top, then choose the second paper and you will see its URL in IDM

for example the link is