Nevertheless, if you have some applications from unidentified developer in you download wish list, it’s possible to download them even if MacOS Sierra officially states that this is not. In the meanwhile, the applications that are signed by an Apple certificate guarantees that the application is safe or, if it’s not, Apple has all the rights to remove the certificate and notify about malicious activities. That’s because they may contain malware or malicious programs behind the main installer. Applications with no identified developer are questionable and are often called third-party software. On the other hand, prohibition to download unsigned applications adds some extra points to Mac OS Sierra’s security and malware resistance. On the one hand, this might be really frustrating as people often can’t find needed applications on The App Store or identified developers only. Lots of MacOS Siera users complain about the restriction to download applications from unknown developer.