You can download the official version of Granny 3 on Google Play.
You can find the download and store links for across various platforms below: granny-3-game-link
The game is available for purchase and download on Steam for Windows systems. You can download the official version of Granny
Note that Granny 3 was rejected from the App Store because it was incorrectly identified as spam by Apple's review process. granny-3-game-link