I think if you go to your SH3 game folder, find the SH3.exe file, and right-click on it and open its Properties, you should be able to see which version it is there. Mine (under the Details tab) says File Version 1.4.0.1 and Product Version 1, 4, 0 1 - I assume that refers to the fully patched v1.4 which is what I have.
If your copy of SH3 is a more recent purchase (whether disk or download), it may already be v1.4; I downloaded mine direct from Ubi over a year ago and it came fully patched to the latest version.
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