Updates for SME 6.0 are found on the e-smith mirrors. You can get a list of these mirrors by following the "Downloads" link on the contribs.org homepage. Here's an example of how to download and install the updates:
1. Go to a login prompt by typing Alt-F2.
2. Log in as "root" with the admin password.
3. Get the updates by typing all on one line "wget -r -nH --cut-dirs=3
ftp://ftp.ibiblio.org/pub/linux/distributions/e-smith/updates/6.0/RPMS" (without the quotes).
4. Type "cd e-smith/updates/6.0/RPMS" (without quotes).
5. Upgrade with the rpm command. Type "rpm -Uvh --oldpackage --replacepkgs --nodeps i386/* noarch/*" all on one line without quotes. This invokes the Red Hat Package Manager (rpm) to upgrade (-U switch) verbosely (-v) printing hashes for progress (-h) all packages in the i386 and noarch subdirectories. You need the --oldpackage flag for the dovecot package, --nodeps for the SMEServer package and --replacepkgs for all packages that don't strictly need updating. Typing "man rpm" (press "q" to quit the manual) shows more usage instructions.
6. Type "/sbin/e-smith/signal-event post-upgrade" (on one line, no quotes).
7. Type "/sbin/e-smith/signal-event reboot" (on one line, no quotes) to reboot.
P.S. "rpm -q packagename" shows what version of packagename you have installed.
HTH