If you have a recent copy of SH3, purchased within the last couple of years (at least), it is probably already patched to v1.4. Find your game folder and right-click on the Sh3.exe file, click Properties, and look through the info under the different tabs that come up in the Properties box for the file version. If it comes up as 1,4,0 etc. you have v1.4 already.
If it's not already patched there are several different versions of the patch depending on which version of the game you have: digital or DVD, US or other regions (EMEA):
http://www.subsim.com/radioroom/show...71&postcount=6
so you need to make sure you have the right one for your particular copy of the game.