Why won't the update download on my iPhone?

Vicki142

I have a notification on my iPhone that I have an update and it started to download but then I get an error message that it can't finish the download. But in the meantime I can't play the game because the icon is black as if it is downloading. I've tried deleting the app to redownload but it won't delete. Now the app is of no use and I play it all the time. 

StuckInATree

How much free memory do you have available on your iPhone?