Amazon calculates a product’s star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers, and factors that establish reviewer trustworthiness.
So far so good. It is only a buck. Just a buck, and to those who said it only works sometimes well I hope that is not the case. I guess on!y time will tell. It downloaded quickly. My emails were there.