Yes, you need this intermediate step. Download the official v1.4 patch from Subsim or The Archive. Install it.
Uninstall Silent Hunter 4 via Control Panel. Delete the Ubisoft/Silent Hunter 4 folder manually. Old config files will corrupt v1.5. Silent Hunter 4 1.5 Patch Download
If a website offers you a "Silent Hunter 4 1.5 Patch download" in a 10MB .exe file, run a virus scan immediately. The real file is always 1.5GB or larger. Have a different issue? Join the Subsim.com forum (Over 1 million posts on SH4). Mention "v1.5 missing .dll" or "JSGME mod order" and you will have an answer in minutes. Yes, you need this intermediate step
Run the 1.5 installer. Point it to your SH4 directory (e.g., C:\Program Files (x86)\Ubisoft\Silent Hunter 4 ). Uninstall Silent Hunter 4 via Control Panel
| Mod Name | What it Does | v1.5 Required? | | :--- | :--- | :--- | | | Overhauls the entire Pacific War; adds 300+ new ships, accurate aircraft, and dynamic campaigns. | Yes | | Trigger Maru Overhauled (TMO) | Hardcore realism: Reworked AI, realistic dud torpedoes, manual targeting required. | Yes | | Real Fleet Boat (RFB) | Focus on historical accuracy for US submarine systems (radar, sonar, torpedo performance). | Yes | | Operation Monsun (OM) | Expands the German U-boat campaign into the entire Indian Ocean and Atlantic. | Yes (Requires OM v705) | | Pacific Environment (PE4) | Adds dynamic weather, realistic wave heights, and volumetric clouds. | Yes |
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Install from your original CD or digital backup. Do not launch the game yet.