- Download vSphere ESXi ISO from here: https://www.vmware.com/go/get-free-esxi
- Download UNetbootin (Linux, Windows, Mac OS) or Rufus (Windows).
- Start UNetbootin and choose:
- Diskimage
- ISO
- Select the downloaded ESXi ISO
- Type: USB Drive
- Drive: Select your USB drive
- Select OK
- Boot your host off of this USB drive.