MacOS Catalina will be introducing with the latest features which require testing before they will be a launch to the public. Apple is offering the early version of the macOS that drop to developers as they may check app against it then prepare it for Mac owners. If you want to download and install macOS Catalina 10.15.4 beta 1 to the mac, then this post might be useful for you. Read through the blog and follow the instructions to execute it.
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