Apple officially stated that AirDrop required specific Wi-Fi and Bluetooth 4.0 hardware to create an "ad-hoc" network for high-speed transfers. While older devices like the iPhone 4S had Bluetooth 4.0, the iPhone 4 did not, often leading to slower transfer speeds when using the enabler tweak on those specific models. The tweak bypasses these checks, though performance may vary depending on the age of your hardware.
If you have a compatible device running iOS 7, you do not need a download. Follow these steps: Open Control Center: Swipe up from the bottom of any screen. Locate AirDrop: button located next to the AirPlay icon. Choose Visibility: Contacts Only Enable Connectivity: Ensure both airdrop enabler ios 7.0 download