If you have the original 2007 disc version (v1.0), you must first patch it to v1.4 (which is free on sites like
Silent Hunter 4: Wolves of the Pacific , the is not a free standalone download; rather, it is identical to the U-Boat Missions expansion . Because version 1.5 is required for most major "mega-mods," you must own this specific add-on to reach that version. How to Acquire Version 1.5 Silent Hunter 4 1.5 Patch Download
Need mod recommendations for v1.5? Let me know and I'll list the best ones. If you have the original 2007 disc version (v1