Citicastaways, please provide some more info on the file you downloaded- I'm not sure it's the right patch number. I don't keep great track, but I thought the newer version was 1809.
-Assuming it's the right one, it will end in .ISO which is a certain file type. You can't send this over to your USB drive as is, because in your computers impaired state, it can't use the ISO file like it should be able to. Instead, the instructions have
you open the ISO, then copy the raw files over to the drive.
This step is crucial, because otherwise you can't access Setup, as you have found.
Double-check for the .ISO file extension, and open this like a folder so you can see the files. If you are unable to open the file, you may have to download an ISO tool like Alcohol 120%- find on Google.
You may also need to format your USB drive- to do this right click on it and choose format, and be sure to pick NTFS.
*This will wipe all drive data, and be sure you're formatting the right drive!!**
After this resume instructions, and you should be good to go. I'll re-post them here.
Let me know how it goes