Preheat oven to 350 degrees. Prepare pie crust or line a 9inch glass pie plate with a refrigerated crust per package instructions. In a medium bowl, combine beaten eggs, butterscotch topping, melted butter, sugar, salt, butterscotch schnapps, walnuts, oatmeal and raisins. Mix until well blended, then pour into prepared crust. Bake for 50-60 minutes or until a knife inserted halfway between the center and edge of pie comes out clean. Serve warm or cold, with whipped cream, if desired.