If you want to create a bootable installer for OS X 10.11 El Capitan, you'll need a USB drive with at least 8.6 GB of free space. You can use the following Terminal command:
| Risk | Explanation | |------|-------------| | | Modified installer images may contain keyloggers, ransomware, or backdoors. | | Expired certificates | Unofficial DMGs often fail to verify, causing installation errors or corrupted OS. | | No security patches | Using El Capitan online exposes you to hundreds of known unpatched vulnerabilities (CVEs). | | Broken HTTPS/TLS | Root certificates are outdated; many websites (including GitHub, banking sites) will fail to load. | os 10.11 download