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Thanks, But this is still not helpful. I'm not sure what to do. Can you be more specific?

Hi, I am using a Dell Inspiron 15R 5537 with an i7-4500u and 2x 8GB sticks of DDR3 ram. I successfully installed macOS Mojave on an external drive using unibeast, and it runs flawlessly. I cannot, however update to macOS Catalina natively or through the unibeast Installer. I am running Mojave...