Set your motherboard to UEFI mode , disable Secure Boot , and set SATA mode to AHCI .
Select the USB drive in your boot menu (often F12 or Del ) and choose "Install macOS Catalina" from the bootloader menu.
The primary source for the .raw or .dmg image files.
To get started with the full download, you typically need to visit the Olarila macOS DMG Collection thread on their official forum. System Requirements
The Olarila image is a "raw" installer file designed to be flashed directly to a USB drive. Unlike a standard Apple installer, these images often include:
I can then help you find the exact or BIOS settings needed for your specific hardware. i need catalina 10.15.7 link PLEASE - Hackintosh Olarila
Typically integrated with Clover or OpenCore to allow non-Apple hardware to boot macOS.