Some complain about Apple’s walled garden, or if you prefer a less flowery term: closed platform. Apple would say that maintaining a level of control over the apps we can install on our devices protects us from malware and a bad user experience, but it can be frustrating and worrying if you want to run an app and you are confronted by a warning that it is from an unidentified developer.
Luckily it is possible to open and run these apps and we will show you how. But before you do so be warned: do this only if you are satisfied that the developer and software (and the means of distribution, since innocent apps can be hijacked by guilty parties) are legit. We discuss the safety of unidentified apps later in this article.
For advice about downloading and installing apps read: How to install apps on the Mac.
Read more at Macworld.com