OS X improves download validation by providing file quarantine in applications that download files from the Internet. This means that downloads are checked for safety (known malware) when you try to open them. Antivirus free program for mac. Best program for making slideshows on mac.
You can check an app (or any file) in quarantine using terminal. It's literally an extended file system attribute: mac:~ user$ xattr /Applications/Some.app com.apple.quarantine mac:~ user$ If you're absolutely sure it's safe to run the app, you can drop the attribute like follows (you'll be asked to provide your password): mac:~ user$ sudo xattr -r -d com.apple.quarantine /Applications/Some.app Check once again: mac:~ user$ xattr /Applications/Some.app mac:~ user$ Now you should be able to run the app.
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If the app was extracted from an archive, it might be your archive extraction utility. After checking out the other answers found here, none of them were working for me. Eventually I realized the issue was my archive extraction utility (Keka 1.0.6) was silently failing to extract the app from its.zip file, and even though the app looked intact with the correct icon and everything, it was failing to read the package contents and would throw up a generic error message: The application “AppNameHere.app” can’t be opened. I swapped back over to using the built-in 'Archive Utility.app' and everything went smoothly after that. So if sudo spctl --master-disable doesn't work and xattr shows the file isn't quarantined, try a different extractor utility.
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