From GWX 2.1 Manual:
GETTING STARTED
System Requirements
The Grey Wolves Expansion (GWX) team suggests your computer meet the recommended system configuration requirements for Silent Hunter III; use the Silent Hunter III Detection Tool to determine whether your system meets these requirements. We have found that running with less than the recommended configuration can result in choppiness and low frame rates (frames per second), and can occasionally result in freezing or locking up your game. GWX requires 3.3 gigabytes of free disk space.
Installing the Grey Wolves Expansion
Basic Installation
You must install The Grey Wolves Expansion (GWX) over a CLEAN, UNMODIFIED installation of Silent Hunter III patched to Version 1.4b since the installer will only install GWX into your Silent Hunter III installation folder. The following instructions may apply to you depending on how you have modified Silent Hunter III:
1. REMOVE any installed SH3 Commander files (if you use SH3 Commander) by pressing the "Rollback SH3" button from within SH3 Commander
2. You can use JSGME to activate other modifications after you install GWX, but not GWX itself
3. GWX is a full/general release that completely supersedes all previous versions of ―The Grey Wolves‖ and GWX. See the section on ‗Installing under ―Windows Vista‖‘ if you are using that operating system.
a. Uninstall Silent Hunter III via the MS-Windows ―Add/Remove programs‖ feature
b. Open Windows Explorer and:
i. *delete* the folder from where Silent Hunter III was just removed
ii. *delete* the ―\My Documents\SH3‖ folder. GWX V2.0 is incompatible with non-GWX save games and is likely incompatible with games saved under previous GWX versions.
c. Reinstall Silent Hunter III
d. Install patch V1.4b if your version of Silent Hunter III was an earlier version, ensuring the patch version corresponds to your source media: Download, DVD, EMEA, or US).
e. Visit the GWX homepage (
http://gwx.mysite.orange.co.uk) and download all the primary files listed there. Send them all onto your desktop or onto a folder of your own choosing, but please ensure they are all loaded INTO THE SAME FOLDER.
f. Run GWX.exe and follow the installation prompts
Installing under Windows Vista
Perform the following steps if you are installing GWX in a Windows Vista® environment, assuming you have already executed Steps 1 and 2 in the Basic Installation procedure:
1. Uninstall Silent Hunter III
2. Delete the residual Silent Hunter III installation folder and all contents
3. Delete (or at least rename) your ―MyDocuments\SH3‖ save game folder
4. Delete the ―C:\Users\<Username>\AppData\Local\VirtualStore\Pr ogram Files\SilentHunterIII‖ folder and all its contents, if it exists.
5. Reinstall Silent Hunter III. The GWX Team recommends you install it outside of the ―\Program Files‖ folder
6. Right-click the 1.4b patch ―.exe‖ file and select ―Run as administrator‖
7. Install the patch
8. Verify you installed the patch correctly by running the game.
9. If the game fails to run, download and install the StarForce Vista update from the StarForce developers‘ site:
http://www.star-force.com/support/sfdrvup.zip.
10. You can now run optional tools like SH3 Commander, JSGME, SH3Gen, etc. provided you run them as an ―Administrator‖ after you have installed them.
The GWX team recommends reading up on the Microsoft Vista ―User Account Control‖ and ―File Virtualization‖ features for greater familiarity with Windows Vista system security issues that may affect Silent Hunter III.
Hope will be useful. Enjoy!