Hello Foffy! Welcome to SubSim!
The Pre-War starts might be listed last, so scroll the "date" choice down beyond 1945, and you should see Alaska, New Construction and possibly Pre-War. I am not certain, since I don't have the mod on this computer I am on.
Does the game run fine otherwise? You do have to set the "Compatibility" properties in the SH4.exe very similarly to the SH3.exe settings. You also should use
4GB Patch or the similar LAA applet on the SH4.exe, which has to be write-enabled prior to their use...
