Cannot install iReal Pro

[Dioxic]

Hey guys,

I had iReal Pro installed on my previous computer, but the hard drive died. I just replaced the drive and upgraded to OS X Yosemite.

I've tried to install iReal Pro from the app store, but when I do it says downloading for a fraction of a second and then just skips to installed...

If I click open in the app store or double click the app icon nothing happens. When I open "show package contents" it shows that there's pretty much nothing there.

After a long time I get the message "iReal Pro - MusicBook & PlayAlong failed to download. Use purchase page to try again." However, every time I go to the purchase page it just says installed. If I wait long enough it says "An Error Has Occurred" in red next to the install button.

How can I resolve this?