Post process add on won't open in my computer

I just received back a computer that was repaired and decided to download new Fusion 360 and Crossfire programs. All proceeded as planned but when I attempted to open the download of the bridge that joins them it wouldn’t open in my computer. It may have something to do with computer security. I can’t seem to figure this out. Any helpful advice?

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It is important to note that you cannot use the post processing menu of Fusion 360 until you have a valid toolpath generated in the Fabrication work area, and a toolpath cannot be generated until you have created a tool in the Tool Library menu.

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Installing fusion 360 post processor