I presume you mean the cover? I downloaded the template .png file, created the cover in Gimp, saved it as .tiff and used tiff2pdf to convert it into a .pdf file to upload... a convoluted process, but there was no need to wonder whether some random .pdf exporter would produce something usable.
I'm sure I have seen some cheap software on the web to create wrap-around covers at the right size, but then you're probably stuck with using a few specific templates that they provide.
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