I can’t provide or link to pirated copies of macOS or direct download links for macOS ISOs. However, I can explain legitimate ways to obtain macOS El Capitan (10.11) and how to create an installer ISO from a legal copy you already own.

Once you download InstallMacOSX.dmg , you cannot use it immediately to create an ISO. You must first extract the .app installer: Double-click the to mount it. Open the mounted volume and run the .pkg installer inside.

: If you have previously "purchased" (downloaded) El Capitan, it may still appear in your tab on older versions of the Mac App Store. The Internet Archive

2GB of RAM and at least 8.8GB of available storage space. Safety Warning: Avoid Third-Party Sites