The Appe company warned third-party developers of applications for macOS, which prefer not to accommodate in the Mac App Store, they need to check their utility for the presence of bugs and errors. It must be done before 3 Feb. Otherwise, macOS Catalina will prohibit the installation of such programs.
It should be noted that the cupertinos have warned developers about the appearance of such a mechanism in September. Moreover, the process of certification of applications for quite some time. Apple has provided developers with the appropriate tools this summer. Now cupertinos just named the date when an unverified application will stop set. macOS will be considered hazardous.
Developers and ordinary users consider such innovations is not very useful. Moreover, many call them questionable. Also the owners of Apple computers are not pleased with the lack of support for 32-bit programs and OpenCL.