Just as I described in the Subtitle.  I downloaded and installed Entrenchment several days ago.  I Started my first game the following day and eventually saved it.  When I went to load my save game it read "invalid save file".  I have repeated this experience several times and all the saves and attempted loads were AFTER installing entrenchment.  I had all the available updates installed prior to playing my first game. 

Any ideas of what to now?

Is there a way to email Stardock tech support directly?  I did not see an email link.

Thanks in advance for any ideas.