According to this Apple Developer page , you cannot request a user more than three times a year .
Provide users with an easy way to provide feedback on the App Store without leaving your application using the SKStoreReviewController API. You can request ratings up to three times in a 365 day period.
This means that if the user rejects the controller, the system will automatically offer to evaluate the application again after a while. You cannot , however , manually install it manually .
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