If you want a clean, reliable PDF of 'Divine Comedy' without legal headaches, I usually head straight for public-domain repositories first. Project Gutenberg is my go-to for classic translations in the public domain — you'll find the Longfellow translation there in plain text and HTML, and you can easily save or print it to a PDF if you prefer that format. For scanned, nicely formatted PDFs (with original page layouts, illustrations, and scholarly front matter) the Internet Archive is fantastic; it hosts scans of many editions, including bilingual and annotated ones, which is lovely if you like seeing the original Italian next to the translation.
A couple of practical tips from my late-night reading sessions: check the translation date and the rights statement before downloading — modern translations (Pinsky, Ciardi, Clive James, etc.) are often copyrighted and not legally free. If you want a polished ebook version, Standard Ebooks produces well-formatted public-domain editions (EPUB/MOBI), and you can convert those to PDF with Calibre if you need a printable file. University libraries and HathiTrust sometimes have high-quality scans, but access can be limited depending on your affiliation.
Finally, if you want a richly annotated scholarly PDF, consider borrowing a scanned modern translation through your local library app like Libby/OverDrive or buying a reputable edition from Penguin or Norton — they’ll often have PDFs or ebooks for purchase. Personally, I love switching between a public-domain translation for late-night reading and a modern annotated edition when I want the footnotes; each experience feels different and rewarding.