Preheat the oven to 350°F (175°C).

Place the pre-made pie crust in a 9-inch pie pan, pressing it down gently and trimming any overhanging dough.

Soak the raisins in warm water for about 10 minutes to soften them.

In a mixing bowl, whisk together the sour cream, granulated sugar, all-purpose flour, eggs, vanilla extract, ground cinnamon, and salt until smooth.

Drain the soaked raisins and fold them into the filling mixture.

Pour the filling into the prepared pie crust and spread it evenly.

Bake in the preheated oven for 45 minutes, until the filling is set with a slight jiggle in the center.

Allow the pie to cool at room temperature for at least 1 hour before serving.