To play the South China Sea campaign legally, you should purchase the base game on Steam or GOG . The expansion is automatically included in the latest official updates. If you are using the PLAZA release:
Be prepared to engage mixed battlegroups that include both modern surface combatants and submarines. Enhancing the Experience with Mods Download Cold Waters South China Sea-PLAZA
Unpack the downloaded .iso or .zip file using a tool like WinRAR or 7-Zip . To play the South China Sea campaign legally,