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:

In the macOS Installer, use Disk Utility to format your target SSD/HDD as APFS with a GUID Partition Map .

To get started with the full download, you typically need to visit the Olarila macOS DMG Collection thread on their official forum. System Requirements

Select the USB drive in your boot menu (often F12 or Del ) and choose "Install macOS Catalina" from the bootloader menu.

Typically integrated with Clover or OpenCore to allow non-Apple hardware to boot macOS.

Tailored for specific chipsets (like 300, 400, and 500 series).

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

Use BalenaEtcher to write the Olarila Catalina image to your USB drive.