You cannot download iPhone or iPad App Store games directly on a PC
Use an iPhone or iPad and sign in with your Apple ID
Open the App Store on the device
Search for the game
Tap Get or the download button
If you want to use the game on a PC, check whether it has a Windows version on the developer’s website or the Microsoft Store
If the game is available on Apple Arcade or as an iOS app only, it will not install on a Windows PC
You can use an iPhone or iPad emulator only if it is legal and supported on your system
You can mirror or stream the iPhone or iPad screen to your PC if you only need to view or control the game
If you have a Mac, you may be able to download some App Store apps from the Mac App Store instead