I'm pretty sure the books you try to convert would need to be DRM free already. I downloaded the "installer" file from that web page, which passed a variety of scans, but it turns out it's not really THE installer, anyway. It needs to connect to the internet to actually download the true installer files. And it wants to install their Zip Archive software (by default) as an added bonus. I gave up at this point. I don't trust installer's that need to connect to the internet. If this uses calibre's engine... I would suggest just using calibre instead.
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