Viber won't download on to new iPhone 5s
I recently lost my iPhone so I brought a new 5s. I downloaded all my old apps but Viber downloaded and hasn't appeared on the phone. When I try to open it within the App Store it doesn't open. My phone was later found so I had my brother delete the Viber app that was on there, but still the viber in my App Store won't open, or give me an option to download it again. Any help would be appreciated :)
iPhone 5s, Viber