I tried to install the Watch ABC (a free app) on my iPad from the AppStore. It would not download. I attempted to install it a second time, and got the message "You've already purchased this, so it will downloaded now at no additional charge." Any advice?

I tried to install the Watch ABC (a free app) on my iPad from the AppStore. It would not download. I attempted to install it a second time, and got the message "You've already purchased this, so it will downloaded now at no additional charge." Any advice? This is a fee app so I do not understand the message referencing a purchased app. I get the cloud symbol, but it will not download. I closed the App Store app and restarted my iPad, but to no avail. Any assistance would be greatly appreciated.