Yes. The button saves a one-page setup PDF named PDF-Editor-Setup. There is no store, no email box, and no card form in front of it. If the save fails, the page says so instead of pretending the file arrived.
Yes. The red button saves the Windows setup page. There is no Mac download.
Free. There is no page counter and no watermark on the file you save. If something is ever paid, it will be said in plain words, not hidden in the export.
One page: how to open PDF Editor, and the jobs it is meant for — edit, sign, compress, merge, convert. It is not your contract, and it is not a store installer until that file is replaced.