An (Android Package Kit) file is the file format used by Android to distribute and install applications. Downloading an APK directly (sideloading) allows you to install the app outside of the Google Play Store.
While the free version is robust, Instories Pro unlocks additional templates, fonts, and removes the watermark. It is safer to subscribe to the official Pro version within the app rather than downloading a "free pro APK." Download Instories apk
Download the .apk file and tap it to install. An (Android Package Kit) file is the file