No specific info about version 15.0. Please visit the main page of Install macOS Beta on Mac Informer.
Create a bootable USB key from OS X 10.9 to macOS Catalina 10.15.
Install and run macOS Catalina on your unsupported Mac.
Install macOS Mojave on unsupported Mac computers.
Install macOS Sierra on unsupported computers.
Download macOS directly from Apple servers and install it on your Mac.
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