https://wccftech.com/macos-catalina-golden-master-released-to-developers-download-now/

Today, Apple has seen fit to release the macOS Catalina Golden Master version to developers. The build arrives a week after Apple released the tenth macOS Catalina beta. In addition, it has been over three months since the operating system was first announced at the WWDC. So let’s dive in to see some more details on how you can download macOS Catalina’s latest build on your supported Mac devices.

macOS Catalina Golden Master indicates that it is the last version of the firmware which will be provided to the public at release. If you’re up for it, the new version can be downloaded through the Software Update mechanism in System Preferences once you have installed a proper configuration profile from the Apple Developer Center.