Apple released iOS 13.1.3, but also the additional update for macOS Catalina 10.15. The update is already available to all owners of compatible Apple computers.
In the new version of macOS Catalina fixes some errors found in the final version of the latest desktop operating system from Apple, including the problem of hanging during installation of the OS. In addition, the cupertinos have eliminated a bug that prevented the entry of several iCloud and save the data in Game Center if you play offline in the Apple Arcade.
It is noteworthy that, in itself, the update was quite large. Its weight is about 1 GB. The cupertinos is not informed of any global changes.
At the moment there is no network feedback about the new version of macOS Catalina. It is likely that in addition to the above-mentioned shortcomings, Apple has eliminated other bugs.