: On a Mac currently running Catalina or newer, you can download the full installer by running:
If you search "Download macOS Catalina 10.15.7 DMG File" on Google, you will find dozens of sketchy websites offering direct downloads. Here is why: Download Macos Catalina 10.15.7 Dmg File
Open Disk Utility , select your drive, and erase it using Mac OS Extended (Journaled) format and GUID Partition Map . Name it CatalinaUSB . : On a Mac currently running Catalina or
Your download is incomplete or corrupted. Delete it and re-download using the softwareupdate terminal command (Method 2) to ensure integrity. select your drive