To download and use on an iPhone or iPad , you cannot use an APK file, as these are designed exclusively for Android . Instead, you must download the official IPA version through the Apple App Store to ensure security and compatibility. Why You Can’t Use an APK on iOS
If you are searching for a "Hotspot Shield APK for iOS," it is important to understand that and iOS are fundamentally incompatible. Does iOS device run an apk file? - Apple Support Community