APFS BootROM Support: If you have a machine that supports High Sierra natively, you MUST ensure you have the latest version of the system's BootROM installed. If you have NOT previously installed High Sierra, you can download and install this package (if running OS X 10.10 Yosemite or later) to install the latest BootROM version (you MUST reboot after installing the package to apply the firmware update). When installing, ensure your system is plugged in to power, or the update will not be installed.
See if your Mac can handle the Patcher.
Tested Macs listed below. Here are the minimum requirements: