I downloaded the numbers app to my Mac Pro and it will not open says it was downloaded from an unapproved supplier

I downloaded the numbers app to my mac pro it has been installed but will not let me open. Says it wasn't from an approved supplier. I'm new to macpro so just need some assistance

I'm not sure. Not really great with computers so i just went to the apple store to download. I thought that was what I would need to do. Paid $19.99 for. So I have no clue what I done.

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