I purchased Command Naval Air Game of the Year and then bought Spratly. Spratly wont install says main game needs update 1.11.5. The main game has been checked and has the most up to date patch. What can I do?????

I purchased, installed and updated Command Naval Air Operations Game of the Year and purchased Spratly Spat. I tried to install Spratly Spat and it says I needed to update the main game to 1.11.5. The main game says I have the most recent update. How do I resolve this???