Hi SubMate your SH3 Steam download is already Patched to 1.4 heres a quick check to put your mind at rest
when you hover your mouse pointer over your SH3 exe it says File Version 1.4.0.1
the reason your GWX wont run is its a big mod and needs more addressable memory you need the 4 gig patch link beow
https://www.subsim.com/radioroom/dow...o=file&id=2888
Also if you are using the Commander Mod you will need the Commander mod Config File for GWX Link below
http://www.thegreywolves.com/downloads/
Commander Mod download Link
https://www.subsim.com/radioroom/dow...o=file&id=4789