I don't know where you're downloading/purchasing it from, but yeah, the upgrade should read "U-Boat Expansion Pack for SHIV" or something to that effect. This should place you at version 1.5. And yes, you can play all the old missions. Nothing changes in that respect, except now you have some limited U-Boat missions and can download the Operation Monsoon mod if you want to expand your U-Boat adventures.
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