I used suse 10.1 for some time. I probably still have the disks.
The way to “upgrade” is:
Do a fresh install of the newer version (I suggest 11.4, which is the current release).
If your “/home” is a separate partition, then keep that as is - do not reformat. That will retain all personal files.
If your “/home” is not a separate partition, then back it up to an external drive, and later restore what you want after the new install.
However, you may have other problems. Both KDE and Gnome have changed a lot since the 10.1 days. So your personal settings might not be any good either.
What I would do, after the install:
1: Use CTRL-ALT-F1 to get a virtual terminal. Check that the UIDs for users are the same as in “/home”. If not, you can either change “/etc/passwd” or use “chown” on home directories to fix that.
2: CTRL-ALT-F7 to get back to the GUI.
3: Login and see what happens.
4: If it is a mess, then logout, use CTRL-ALT-F1 for a virtual terminal, and login as yourself. Then
mkdir OLD
mv .??* OLD
logout
That should move all of your old personal settings out of the way, so that you can see what the defaults are for the new system.
After seeing how it was with the old settings, then seeing how it is with the new default settings, you can think about what you want to rescue from that OLD directory to recover old settings.
That’s about how I would do it, and about how I have done things when making a big change. It’s up to you to decide how you want to handle it.