MacRumors published a story that Apple has released the fourth beta of macOS Catalina 10.15.4 to registered developers.
Apple Seeds Fourth Beta of Upcoming macOS Catalina 10.15.4 Update to Developers
Apple today seeded the fourth beta of an upcoming macOS 10.15.4 update to developers for testing purposes, one week after seeding the third beta and more than a month after releasing macOS Catalina 10.15.3.
Apple Seeds Fourth Beta of Upcoming macOS Catalina 10.15.4 Update to Developers
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.
