https://wccftech.com/apple-releases-macos-catalina-10-15-1-beta-2-watchos-6-1-beta-4-and-tvos-13-2-beta-3-to-developers/

Apple has seen fit to release macOS Catalina 10.15.1 beta 2, watchOS 6.1 beta 4 and tvOS 13.2 beta 3 to developers for testing purposes. The new beta builds arrive under a week after the company released the third beta of watchOS 6.1 and the second beta of tvOS 13.2. If you're a developer, you can download and install the latest build from the Apple Developer Center. Let's dive in to see what the new beta builds have in store.

If you're looking to install watchOS 6.1 beta 4 on your compatible Apple Watch, be sure to note that a proper configuration profile is required from the Developer Center. The new build can be downloaded through the dedicated Apple Watch app on your iPhone. Simply head over to General > Software Update.