You are right that their Web page is confusing. But the Desktop installer version of 7-PDF Maker is really freeware. The shareware version is the portable version. Here is the answer I got from their Live Support (“Online Chat”):
Quote:
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Because of the complex development to run a PDF Converter on a USB Stick it's shareware. But the windows version (installer version) is freeware!
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The freeware installer is named “7p151.exe”.
The portable installer is named “7-PDF_Maker_Portable_1.5.1.paf.exe”