I did and still downloaded again.
I have not used dd.
I found my thumb drive with mate 15 on it that I originally used to
install the OS so I know at least at that point unetbootin worked then.
I moved from kubuntu to ubuntu to use disk creator. That did not
work either.
Im getting three possible errors:
isolinux.bin missing or corrupt (been researching this one)
Missing operating system
and
Not a bootable drive.
The first one is the one Im seeing the most so Im
focusing on that one now.