Admiral, your stock game "Version" can be found in the lower right hand corner of the games "Main Menu" page:
Steam sells you the 1.3 version (those guys could have at least sold the v1.4...a much better version than 1.3.....but Nooooooo!), with the expectation of getting you to buy the last patched version....v1.5, that also has the U-Boat Missions!!
You apparently have v1.3 installed?? Fotrs Ultimate won't run on a 1.3 version of the game