Fair warning. Even the 1.5 version still has the odd bug in it. Don't be put off by that. Get to know the stock game, warts and all then I highly recommend either the Trigger Maru Overhaul Mod or the Real Fleet Boat Mod combined with the Run Silent Run Deep campaign mod. A combo of those will give you much more historical authenticity wrt shipping lanes, aircraft intercepts etc and make the game more challenging.
Welcome and enjoy.
