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The solution is :1-Another Mac PC with OSX Catalina Beta2- Or go to https://developer.apple.com/account/ and upgrade to another mac to Catalina Beta3-From this OSX you can download the .app of catalina Beta4-Create USB with the command in this web5-http: //osxdaily.com/2019/06/06/make-macos-catalina-beta-usb-boot-install-drive/6-Start the PC with option7-Install from the USB