That fixed it... Thank you to everyone who helped solve this.

Thank you for the quick response Mr. Scott. I'm sorry, but as a follow up question, where can I enter the serial key? Every time I try to get to the DLC in the game, it redirects me to the Steam site to purchase it again. I realize this seems to be more of a Steam question but maybe I'm missing wher...

Womble67, those miniatures look great! I recently discovered 10mm myself and I found your blog while looking for a guide to painting WWI miniatures. Your list of paints used was helpful and informative... keep up the good work and thank you for sharing.

I have been getting the same error message about not detecting FOG II when I try to install the Rise of Persia DLC. I should note that I purchased the base game FOG II from Steam and Rise of Persia from Matrix Games, if that changes anything. I tried the steps outlined above, and before I found this...