This installer is specifically for older Macs that cannot run newer versions of macOS. Finding InstallESD.dmg
Once you have isolated the InstallESD.dmg file, you can burn it to a physical USB flash drive (minimum 8 GB capacity) to perform clean installations on older Macs. Using Mac Disk Utility (Legacy OS Versions) mac lion os x 10.7 - installesd.dmg download
The file you download from Apple is a .dmg containing a .pkg installer. To find the actual InstallESD.dmg used for booting: This installer is specifically for older Macs that
Downloading legacy software requires caution. Only trust reputable sources. mac lion os x 10.7 - installesd.dmg download