The current macOS interface may not show PDF export, but DjVuLibre can still create a PDF from Terminal: brew install djvulibre ddjvu -format=pdf "input.djvu" "output.pdf" This converts all pages into an image-based PDF. Searchable text may require a separate OCR step. A browser alternative is DjvuPDF Tools. Disclosure: I operate that service. The command above is the direct free/open-source route.
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