There is no full tar file for NAF and probably won't be for several weeks. You NEVER flash older tars with the S4 anymore. Once Samsung implemented the full knox bootloader it prevents you from going backwards. Your best bet if you want your phone to work is to take it to Sprint and tell them the update to Kit Kat failed and they should be able to flash your phone back to NAF, or they will replace it.
Phones & Tablets: Galaxy S4, Galaxy Note 8", Evo 4g LTE, Evo 3D, Acer Iconia A500, Samsung Galaxy Tab 2 10.1, Ipad 2, Nabi 2,
Rom: Rooted Stock Odexed, Hotspot Mod, Xposed, Wanum, several other xposed tweaks