Preheat oven to 350°. In a large bowl, combine crumbs, sugar and cinnamon; stir in butter. Press into an ungreased 13x9-in. baking dish. In a large bowl, beat cream cheese until smooth. Beat in sugar and eggs until fluffy. Pour over crust. Bake 15-20 minutes or until set. Cool on a wire rack., In the top of a double boiler or a metal bowl over simmering water, combine pumpkin, egg yolks, 1/2 cup sugar, milk, cinnamon and salt. Cook and stir over low heat until a thermometer reads 160°; remove from heat. Transfer to a large bowl; wipe out double boiler. , In a small saucepan, sprinkle gelatin over cold water; let stand 1 minute. Heat over low heat, stirring until gelatin is completely dissolved. Stir into pumpkin mixture; cool., In the double boiler, whisk egg whites and remaining sugar over low heat until temperature reaches 160°. Remove from heat; using a mixer, beat until stiff glossy peaks form and sugar is dissolved. Fold into pumpkin mixture. Pour over cream cheese layer. Cover and refrigerate for at least 4 hours or until set. , Just before serving, in a large bowl, beat cream until it begins to thicken. Add sugar and vanilla; beat until stiff peaks form. Spread over pumpkin layer.