Purchased app that has disappeared from home screen and was not deleted
i had an app for Night Owl security camera on my iPhone 6, one day it was gone and can’t figure out how to get it back. I have gone to App Store, purchased and will only allow me to open the app, does not give me the option to download back from the cloud . It shows that I already own the app but can’t get it back on home screen. What do I need to do.
iMac (27-inch Mid 2011), OS X Mavericks (10.9.2)