You can create multiple installations without MultiSH4, but it works better with it. The program allows you to route the different installs into different folders, and keeps track of them all.
You'll be better off using 1.5 U-Boat Missons for both, as it upgrades the American side too, and all the newer mods were made just for that version. With Multi-SH4 you can have as many installations as you like, One for German with OM, one for American with RFB, one with TMO, and even an extra for stock to use when testing mods.
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“Never do anything you can't take back.”
—Rocky Russo
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