The template above is Markdown, which is plain text — it pastes into Google Docs, Microsoft Word, Notion, Confluence, Linear or a repository README without anything in between. Google Docs converts the headings and lists back into formatting on paste when Markdown is switched on in its preferences; where it is not, the text arrives complete and takes a minute to style.
There is deliberately no .docx to download. A binary template is a second copy of this page that stops matching it the first time a section changes, and the thing people actually want — a document with their own answers already in it — is what the generator produces in one pass.
One formatting note for Word: keep the numbered headings as headings rather than as bold body text. Word's navigation pane and table of contents both read the heading styles, and a fifteen-page PRD nobody can navigate is read once and never again.