@divemonkie
Anvar1061 made a possible fix:
https://www.mediafire.com/file/5ywfy...ar1061.7z/file
If it doesn't work try to change graphics setting.
@OGHase
If it CTD with no other mods in single missions or campaign there is something with the installation.
Naval academy does work?
Most likely the 4gb patch isn't installed properly.
Try to delete all SH3 manually, even in your windows documents folder. Then make a new install with a different name.