When I try to open a zip file, I get a message that state operation not permitted. What do I do to correct this?

I've retrieved a download application in zip file format. During download, a message appears that states decompression failed. When I try to open the file, I get a message that the operation is not permitted. How do I correct this situation?

Make sure the place you are downloading the zip file isn't using a password protected zip file. 
What operating system are you using?
Have you installed any decompresison software, or are you using the system built-in software?
Where are you downloading the application from?
Is your data backed up?
Are you using any firewall software or system optimization software, or any browser addon software?

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