Hurd installation problem

[Mohamed . ILANE]

Hi,
I have downloaded the iso images of debian-hurd distribution from
ftp.planetmirror.com : hurd-f2-main.iso and hurd-f2-extra.iso and i burned
then on cd using cdrecord for linux
for the installation of the hurd :
1- I boot from the cd
2- I create a partition of 500 Mb on my scsi disk
3- I format the partition and i mount it on /
4- I choose "install the base system" , i choose the installation from the
cdrom, an error appear "can't find the file BaseHurd.tgz"  each time i
choose a different directory in the cdrom
can anyone help me to resolve this problem
ps: there is no BaseHurd.tgz on the cd
thanks