It depends on when you downloaded the All In One Installer. If you look in your LDraw/Models folder, there should be a set of Note[YYNN]CA.txt files (e.g. Note1101CA.txt), one for each parts update listed here.
It is important that you install the updates in chronological sequence - so if your latest update is 2012-01 (Note1201CA.txt), you should install the entire 2012-02 update (not just one or two files) before installing 2012-03 and 2013-01. Then you will be up-to-date.
It is important that you install the updates in chronological sequence - so if your latest update is 2012-01 (Note1201CA.txt), you should install the entire 2012-02 update (not just one or two files) before installing 2012-03 and 2013-01. Then you will be up-to-date.
Chris (LDraw Parts Library Admin)