Updating is sooo easy:

1) First you'll need the .seu files (here). Then go to File -->Update Database.
2) Then navigate your way to the directory with the *.seu files.
3) Then hit OK and watch the update happen. Once finished you will see the a result's window with statistics.
4) You will then be asked if you want to remove the update file. If you don't need them anymore, then delete them. But you may want to keep them if you ever delete Serials 2000 or install it on another machine and need to update quickly.