-
Get FetchMacOS and place it in a known folder.
-
Open
Command Prompt
and usecd
to go to the known folder. -
Run
fetch-macos.exe -p PRODUCTID -o SharedSupport
wherePRODUCTID
is the macOS package you want to download.
-
Rename
InstallESDDmg.pkg
inside theSharedSupport
folder toInstallESD.dmg
-
Edit
InstallInfo.plist
using WordPad (or another text editor) and remove thechunklistURL
andchunklistid
keys for InstallESD as well as renameInstallESDDmg.pkg
toInstallESD.dmg
(example here)
-
Format the USB drive using Boot Disk Utility. Select
DL
andSave after DL
for Clover Bootloader Source,Clover
for Format Options, and a200MB Boot Partition Size
for Multi Partitioning -
Extract
4.hfs
from\SharedSupport\BaseSystem.dmg
--> save to it's local folder -
Restore
4.hfs
to the USB's second partition ---> 2nd partition becomes bootable "OS X Base System"
Open Paragon Partition Manager Free and resize the second partition of the USB drive to the full size allowed. Don't forget to apply the changes at the end.
-
Open TransMac and navigate to the
HFS+ Volume/Install macOS High Sierra.app/Contents
folder. Right click anywhere in the empty space on the RHS pane and selectCopy Here
. -
In the next stage, select the
SharedSupport
folder we created earlier as theFiles and Folders to be copied to the Mac Volume
.