First, this is for FX and Ryzen Processors
Now the download is here:
You will also need Kext Utility attached to post to download. Copy the System.kext into /System/Library/Extensions. After you copy the kernel and System.kext to recreate the prelinkedkernel.
Follow this video to install it:
If anything errors out you can always boot off your USB Installer and run PostInstall again to put it back to original specs.
Gigabyte Z370 HD3P
GTX 750 TI 2GB RAM OC
32GB of RAM
High Sierra 10.13.6
Windows 10 Pro X64