Mod Development & Installation Acknowledgements It will activate and run on them all, if the game is properly installed and the mod activated as per the FotRSU installation and other instructions found in the Support folder. It does not matter if you have a DVD disk version of the game, a software download, or the Steam download of the game.You will need the version with the Uboat Missions add-on, or the “Gold Edition”. The mod is written for version 1.5 of the game only, and will not work in any of the other versions of the SH4 game.We hope you try this modification built for the “ Silent Hunter: Wolves of the Pacific” (Silent Hunter 4: Wolves of the Pacific) v1.5 of the game. Welcome to version 1.1 of “Fall of the Rising Sun Ultimate Edition” aka: FotRSU. 2.4 Of Refits, New Commands, Rank, and Retirements.2.2 Activating Fall of the Rising Sun Ultimate Edition.