I could not install SME10rc1 from a USB stick made with unetbootin.
In this post from CENTOS
https://tinyurl.com/y5s9zkb8 i found the following:
"Not quite: unetbootin is not suitable for using with the CentOS isos which are what is known as hybrid - meaning that they can boot on both UEFI systems and on Legacy BIOS ones. The bug is that unetbootin rewrites our isos as it copies them and removes that ability from them so they only boot in legacy BIOS mode. If you boot a USB stick created like that on a UEFI machine it will fall through and boot in Legacy BIOS mode and not in UEFI mode. This can corrupt other UEFI operating systems that are already installed.
If you are wanting to write a CentOS supplied iso to a USB stick then all you need to do is copy it to the stick using dd. The same is true of any other hybrid boot iso image."
Somewhere else I found a recommendation for
Win32Diskmanager which I used to make a USB installer stick. That worked. There was also recommendation for
dd and
Rufus both of which have Windows versions.
Cheers
Ian