Depthtok33l, you might want to look at this site for purchasing the "Gold Edition" DVD disk version I posted in
this thread. It's still on sale for the price of just the U-Boat Missions Add-on you found.
The Gold Edition is the complete stock game.....bringing the game up to version 1.5.....with the German U-Boat Missions/Subs already in the files. When ever you can buy a DVD disk, and have it in-hand, its much better than a download (no matter how cheap the download is)!