You don't have to download the full ISO image, you can perform an upgrade online.

• Download http://www.delilinux.de/packages/misc/update_0.7.1-0.7.2.sh and http://www.delilinux.de/packages/misc/update_0.7.1-0.7.2.tgz in a directory and become root
• run

sh update_0.7.1-0.7.2.sh
removepkg openssh
removepkg openssl
deliget install linux-2.4.34.4-i386-1
deliget install openssl-0.9.8e-i386-2
deliget install openssh-4.6p1-i386-1

• Your base system is now updated. Check /etc/lilo.conf and execute lilo. Then reboot. If the new kernel boots flawlessly you may removepkg linux-2.4.33.3-i386-2

• You may upgrade the following packages (first removepkg and then deliget install).

elvis-2.2_0-i386-2
ghostscript-7.07.1-i386-4
perl-5.8.8-i386-1
strace-4.5.15-i386-1
dnsmasq-2.39-i386-1
samba-client-3.0.24-i386-1
expat-2.0.0-i386-1
tiny-xserver-20070515cvs-i386-1
xclients-7.2-i386-1
xfonts-7.2-i386-1
xlibs-7.2-i386-1
xorg-xserver-7.2-i386-1
ayttm-0.4.6-17-i386-2
fluxbox-1.0rc3-i386-1.tgz
fox-1.6.26-i386-3
icewm-1.2.30-i386-1
xelvis-2.2_0-i386-4
xfe-0.99-i386-2
xpaint-2.7.8.1-i386-2
xpdf-3.02-i386-1

• You may want to install this new packages

gutenprint-5.0.0-i386-1
nano-2.0.6-i386-1.tgz
pdq-2.2.1-i386-3
xaw3d-1.5-i386-4
gv-3.6.2-i386-1
konqe-20030705-i386-4

* And you may remove this packages

apsfilter-7.2.8-i386-1
gimp-print-4.2.7-i386-1
lprng-3.8.28-i386-1