Catalina erroring to macOS could not be installed

My setup: dell optiplex 9020 USFF - Dell motherboard - CPU: Intel Core i7-4770S - iGPU: Intel HD4600 graphics. - Trying to install latest Catalina.

I know this has had many inquiries already, so I apologize, but I am getting the macOS could not be installed error with nothing else with it. The dortania guide: I have tried getting the newest copy of macOS, the date thing, I manually changed the CSM in propertree because I don't have that BIOS setting.

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Admittedly, some of this...

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Author: frza