The Key Light Exposure Calculator app is currently unavailable on the App Store. Dealing with the Apple developer account is just too much of a headache for such a niche application as this so looking into self distributing it via this website. For free of course. Hopefully soon but defintiely not before I wrap my current show. Just not enough hours in the day.. If anyone is having trouble with the current version, contact me and I can walk you through troubleshooting.