The 1.3 version currently offered on steam has issues resolved by 1.4 which is not available for dl there as of today 10/11/10. I've packaged an executable containing that collection of files for those who are still dealing with 1.3. The VERY IMPORTANT readme is included before commencing the install because it will not auto detect your specific steam install dir. Prior to doing anything also check your readme in the support folder to make certain you're not already at 1.4 or above. It's based on a clean steam install and thus, mods may be overwritten or creates problems, so it's not a bad idea to extract the files manually first to examine the package.
DON'T USE THIS PATCH IF YOU HAVE THE U-BOAT EXPANSION INSTALLED OR YOU U-BOAT EXPANSION WILL BE BROKEN
Here it is:
http://rapidshare.com/files/42435332..._1.4_steam.rar