I know that this can be a problem and there is a bug report on it. Did Guidry appear in the beginning for you? I know I had a problem where I didn't see him for a few nights when I was also trying to get the license. The hand used for changing to Heroic Mode can summon Guidry. Others have had a problem where the hand was nonresponsive so were unable to do that. i read where some had left the house in the evening and weren't home at 9 pm so he didn't appear. Try being home for several nights and see if he appears for you. Try the hand, and double check your lot type as if changed to residential not haunted residential, that may prevent him from returning. I know I accidentally did that once. Others reported they had to start a new save and it worked on the new one. May try placing a new house on a different lot, making sure it is haunted residential and moving you sim in and see if he shows up there. Good luck!
