You live the risky life, so I’m not surprised to learn you want to try the macOS 10.15 Catalina beta. Currently in the developer beta stage (with the public beta coming in July), all you need to try macOS Catalina now — aside from a willingness to suffer a bumpy, buggy experience — is an Apple Developer account to get started.
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https://www.laptopmag.com/articles/install-macos-10-15-catalina-beta