Apple today seeded the second beta of an upcoming macOS Catalina 10.15.1 update to developers, a little under a week after seeding the first beta and a week and a half after releasing macOS Catalina to the public.
The new macOS Catalina beta can be downloaded using the Software Update mechanism in System Preferences after installing the proper software from the Developer Center.
The first update to macOS Catalina is minor in scale and appears to focus on performance improvements and fixes for bugs that weren’t able to be addressed in the first version of Catalina. An interim supplemental update was released just two days ago with some other bug fixes that needed to be addressed before 10.15.1 was ready.
Read more at MacRumors.com