The stock game is version 1.4, and it only allows gameplay in the Pacific. The 'Gold' version, with U-Boat Missions, is version 1.5, and it corrects some flaws from the earlier version and adds u-boats to the mix, via the Monsun campaign in the Pacific starting in 1943. This opens things up for the supermod Operation Monsun, which adds a complete Atlantic u-boat campaign system for the 1939-1945 war.
Be wary, however. The $10 u-boat missions version you describe sounds like it may be just the u-boat add-on, which means you'll need both versions to play the u-boats. If you can post a link to the exact version you're looking at we can easily tell you which one it is.
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