Follow Vendor's link above.
For GWX3 you will need all 7 GWX3 bin files, plus the GWX3.exe file. You can also get the entire thing in a single torrent download which I think is also available at that link.
Some folks have reported problems with Filefront downloads recently, if you download the GWX3.exe file and it shows up on your computer without the .exe extension, just rename the file GWX3.exe (add the extension) and it should start the install when you open it.
All eight files need to be stored in the same location on your local system so the installation program can access them properly.
You'll also need to start with a
clean, unmodded install of SH3 v1.4; you can't install GWX3 over GWX2.
Welcome aboard and happy hunting!