Olarila is, at its core, a community-driven repository. It hosts forums, guides, and pre-patched EFI folders (the files that tell the computer how to boot macOS). However, their most famous contribution to the scene is the "Olarila Images."
Download macOS Catalina 10.15.7 Combo Update - Apple Support olarila catalina 10.15.7 download
While newer versions (Monterey, Ventura, Sonoma) exist, builders return to Catalina 10.15.7 for several reasons: Olarila is, at its core, a community-driven repository
This is the most beginner-friendly tool for Windows, macOS, and Linux. at its core
: Copy the EFI folder from the USB to the EFI partition of your internal SSD using a tool like Clover Configurator so you can boot without the USB drive. Important Considerations