problems with NXT midstroms target installation

I am trying to install the NXT lego mindstorm target. The installation process breaks with the is message: Cannot download <ftp://ftp.dei.unipd.it/pub/DEI/corsi/ae1/SAMSUNG-s3C2440/bu-2.16.1_gcc-4.0.2-c-c++_nl-1.14.0_gi-6.4.exe>: Error downloading URL. Your network connection may be down or your proxy settings improperly configured..

How can I solve this problem?