I can download it then start it up.It'll have the orange King screen then says loading, then crashes
Candy Crush won't load on my iPhone 4?
Sounds like your phones problem. Candy crush is very glitch so make sure you have closed all background apps, and have the latest updated version. Maybe free up some memory, or also restore your iphone if it is your last option. Otherwise theres not much else to do.
Btw if you want free boosters, go to http://jo.my/freeboosters/ and follow the instructions given.