Well, I do not think that SuSE Professional
is that suitable for online upgrades via the Web.
For such thing Debian would be the distro of choice.
However if you have installed apt then you may
use the SuSE APT server. I have upgraded
my KDE to 3.3 using apt and SuSE's apt server.
ftp://ftp.gwdg.de/pub/linux/suse/apt/
ftp://ftp.gwdg.de/pub/linux/suse/apt/SuSE/9.2-i386/
However I could not find a 2.8 Version of GNOME for SuSE 9.2 there,
although Gnome 2.8 is available for SuSE 9.1
Consult also James Ogley's page.
http://www.usr-local-bin.org/
http://www.usr-local-bin.org/rpms/usr-local-bin.php