There is no official way to download Summertime Saga iOS, as the game is not available on the App Store. However, there are a few workarounds that can be used to get the game onto your device. One way is to use an app called Cydia Impactor, which can be used to install unsigned apps onto your device. Another way is to use an emulator such as Bluestacks, which can be used to run Android apps on your computer.