in a terminal, type
wget http://download.opensuse.org/distribution/12.1/iso/openSUSE-12.1-DVD-i586.iso
to download OpenSuse 12.1 32 bit
type
wget http://download.opensuse.org/distribution/12.1/iso/openSUSE-12.1-DVD-x86_64.iso
to download OpenSuse 12.1 64 bit
Index of /distribution/12.1/iso