This one right?
Here it's out of stock:
http://www.smartkidssoftware.com/nddav8.htm
Spell it Deluxe (1995)
Published & Developed by
Davidson & Associates, Inc
The company was acquired by Knowledge Adventure
http://www.knowledgeadventure.com/
The game is abandonware, we need a review, some screenshots and the game, it's the procedure