How to Allow and Open App from Unidentified Developer in macOS If you understand the consequences and still want to proceed, here is how to override your security settings and open an app anyway from the unidentified developer in macOS. So, it is quite possible that a shady app that you torrented or got from an unverified developer might be infected and dangerous. However, before we begin, a word of caution! It is a common and prevalent practice to insert harmful code and malware into apps and distribute/redistribute them. But if you want to open an app from an unidentified developer in macOS, then here are two ways to do so. By default, macOS allows you to only run apps and software that are downloaded from the Mac App Store or identified developers. Apple is obsessed with privacy and security which is a good thing for us, the end-users.