Hi Lozza79 you have a PM Sir with a SH3 Download Link if your steam is installed in Program Files thats whats causing that SH3 Modification message due to the windows security in Program Files x86 use the SH3 download then run the SH3 stock install play a single mission like Happy Time SH3 makes a SH3 Folder in your documents for all your carrer saves then mod it with GWX or any of
the other super mods.
you will also need the 4gig patch so SH3 can use 4gig memory instead of 2gig so GWX will no longer crash due to out of memory when lots of ships are burning sinking ect.
4gig patch download link
https://www.subsim.com/radioroom/dow...o=file&id=5737