Right now I am in the middle of updating SME6.0.unsupported with rpms starting from 18.12.03 found at the SME6.0.1 RPM folder and update folder at the ftp.ibiblio.org
anaconda-7.3-7es116.i386.rpm
anaconda-runtime-7.3-7es116.i386.rpm
e-smith-base-4.14.1-16.noarch.rpm
e-smith-email-4.14.0-07.noarch.rpm
e-smith-formmagick-1.2.2-02.noarch.rpm
e-smith-horde-1.10.0-02.noarch.rpm
e-smith-hosts-1.12.0-02.noarch.rpm
e-smith-ldap-4.10.0-03.noarch.rpm
e-smith-lib-1.14.0-10.noarch.rpm
e-smith-lib-Tai64n-1.14.0-08.noarch.rpm
e-smith-lilo-1.12.0-04.noarch.rpm
e-smith-LPRng-1.11.0-06ewf.noarch.rpm
e-smith-manager-1.10.0-02.noarch.rpm
e-smith-mysql-1.10.0-02.noarch.rpm
e-smith-release-6.0.1-01.noarch.rpm
e-smith-support-1.4.4-04.noarch.rpm
headers (folder with all files)
initscripts-6.67-1es26.i386.rpm
samba-2.2.8a-2cb.i386.rpm
samba-client-2.2.8a-2cb.i386.rpm
samba-common-2.2.8a-2cb.i386.rpm
samba-swat-2.2.8a-2cb.i386.rpm
TRANS.TBL (maybe useful?)
While connected over PPTP VPN,
I logged in with Putty (SSH2) as root and while in the folder where the rpms are located, gave a command
rpm -Uvh --force --nodeps *rpm
It reported something about smb.conf.rpmnew but otherwise no errors.
Now I am doing just for case a reboot to see wheter it works after the reboot.
Maybe I will update the bootloader too

Then I am going to update MySQL as guided in the Howto area, then I will update PHP and look wether Apache needs to be updated too.
Now I hope that the server will boot up correctly with VPN and SSH (enabled only for local network) access. Otherwise I have to go to the site.
If there is something else I should do, please let me know.
Maybe better would have been:
rpm -Uvh --replacefiles --nodeps *.rpm
OK, I will do
/sbin/e-smith/signal-event post-upgrade
lilo -v
/sbin/e-smith/signal-event reboot
Update:
Everything seems to be working, at least VPN and SSH are fine.
Unfortunately messages contains some errors regarding formmagic 
http://forums.contribs.org/index.php?topic=21535.msg85138#msg85138