HiSierra version of Unibeast will not install to my USB thumbdrive

[SDB49]

My thumbdrive is OSX Extended/Journaled GUID formatted properly and is 7GB.
When I try to install Unibeast, my only option is to install to 1 empty harddrive partition and the USB drive is not an option.
What's wrong?

 

[P1LGRIM]

UniBeast Troubleshooting Notes

Before posting an issue or question with UniBeast please read the following: 1. UniBeast does NOT install anything on your hard drive, it CREATES a bootable USB stick. 2. UniBeast only works on English language systems and is not supported using any other language. 3. UniBeast is not...

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[SDB49]

None of those options seem to apply. I've used this thumb drive before and it worked fine.
Does the HiSierra.app need to be on the machine for UniBeast to initially recognize the thumbdrive?
I tried that as well and UniBeast still doesn't recognize the thumbdrive.