The install appeared to fail, but I've been able to play the game for hours without any problems.  It appeared that the install wasn't able to finish something right at the end.  The install did run for probably 15 minutes, so I assumed it was actually done, and that appears to be the case, as everything works fine.  Seemed peculiar though.  I do notice on the game menu choices, that one field is blank.  The box right above "Load Game" is blank.

Perhaps it's a button that shows up to restart a saved Campaign?  (I have not tried the Campaign portion yet, as I'm one who loves playing randomly generated maps)