There are not a few who have 'woken up' that they can not run keygen applications anymore CORE si X-Force pe MacOS Sierra. In addition to limiting access to install on the operating system applications without signature( unsigned apps), it has also limited the running of some applications known to be created to get serial, licenses and other access codes of some Paid applications. Essay Advantages And Disadvantages Of Diwali Festival more. With the release of the latest OS releases, MacOS Sierra, Apple also brought significant improvements security system.