Unable to install "Garageband" on iPad Pro. Says I must purchase this app to install it

I'm unable to install Garageband on my iPad Pro and I cannot understand how to resolve the issue. The cloud icon indicates I need download it, but when I do so I'm told the "I must purchase this app to install it". When I got to the Apple Store page for the app it's showing the download icon as the simple box as nothing is downloading. Somehow it has become stuck in between being purchased (for free I assume) and downloading and I don't know how to fix it. Thanks in advance.