Use the Hackintosh Tutorial Database for specific kexts (drivers) for your audio, ethernet, and Wi-Fi.
Before booting the USB, enter your BIOS and set the following:
The Olarila image will get you to the installer, but the config.plist included is . You must modify it for your specific hardware.
For final releases, you can find macOS Catalina in the Mac App Store. However, Apple may not keep older versions like 10.15.7 (if 10157 relates to a 10.15.7 beta or similar) available directly.
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