i check out the contribution. there are 3 files on for that contribution, did you just download the most recent one?
coz you should dl the COMPLETE latest package, not just an update.
if your package is not complete, then dl all the files (or the COMPLETE latest package), the replace the latest into the oldest package BY ORDER (the most recent package should be the last to place into the oldest package)
ex. in your case
dl all 3 files, unzip it with winzip if you have trouble unzipping it.
the replace the 2 sep 2002 file with 29 Sep 2002 file FIRST (pay attention to the file structure before replace it, make sure they are in the right spot)
then replace the 2 sep 2002 file (which is replaced by 29 sep 2002, updated files) with 10 Dec 2002 file (also pay attention to file structure, if you are not sure , read the read me file in side each package)
then read the me file in those package. usually the most recent readme file will do the job, but sometimes updated patch will only have one file, so you'll have to read the old version readme file
by the way, the last update patch should be placed in catalog-->includes--->module--->shipping
NOT in the language file
this contribution is pretty old though, make sure it matches your OSC version before you upload it.