I ran into one of these recently. You need to do some work outside Calibre first...to get the myriad files into one single text file. It is actually easy.
Extract the zip, then put all the txt files into a working directory, (like "/work")
Then open a terminal and cd work, then run cat *.txt > mybook.txt
The result will be all that text in a single file called mybook.txt. Bring that into Calibre and take it from there. If the text is messy, you might want to do some cleanup with a text editor before trying to convert it to some other format.
(This is for Linux, but something very similar will work in Mac or Windows...search for how to concatenate text files on your system.)
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