Desktop App Saying Other Copies Are Running

Mac Technical Support
So when I went to open my Battle.net that I just downloaded (new computer) it said, word for word, "Another copy of Battle.net Setup is already running on this computer. Please close it and try again."
When I went to check my desktop for a copy of Battle.net, there was nothing, and the instructions from the error code didn't help at all. How can I fix this?

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