I have just downloaded a £55 app but it doesn't work, help please???

I have just downloaded an app but when I open it It just comes up with a white screen. I have no idea how or where to go to try and reinstal it, at £55 I do not want to have to re-pay for it, can somebody help me please.

Hi..
Helps to tell us which app you downloaded ...
You can try re downloading. You will not be charged again.
How to re download apps from the Mac App Store:
Open the App Store. From the menu bar click Store > Sign In
Click Purchases from the top of the App Store window.
Select which apps you want to re download. Then right or control click where you see Installed  then click Install.
Make sure and use the same Apple ID used for the original purchase.
If that didn't help, if you have anti virus software installed, disable that.
Turn off the Firewall in System Preferences > Security & Privacy
If you have an app called Little Snitch installed, that can prevent apps from downloading.

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