A: Yes. Check archive.org for pre-1923 manuscripts. Because the original text is public domain (Ibn Sirin died in 729 AD), any translation more than 100 years old is free. Newer translations (2000s) are copyrighted.
A: No. The real Al-Kabir (The Great) is typically 500–800 pages in Arabic. If your English PDF is 120 pages, you have an abridged summary. Look for a file of at least 400 pages for a complete translation.
If you are determined to obtain a digital copy, follow this hierarchy of sources: tafsir al-ahlam al-kabir english pdf
A unique feature of this Tafsir is its section on seeing the Prophet Muhammad (PBUH) in a dream. Ibn Sirin rules: "Whoever sees the Prophet in his true form has indeed seen the truth, for Shaytan cannot impersonate him."
Most people searching for Tafsir al-Ahlam al-Kabir are actually looking for the work attributed to Muhammad Ibn Sirin (33 AH – 110 AH / 653 AD – 729 AD). A: Yes
Ibn Sirin was a renowned Tab'i'een (a contemporary of the Companions of the Prophet Muhammad, PBUH). Born in Basra, Iraq, he was a master of jurisprudence (Fiqh), Hadith, and especially dream interpretation. His fame is so great that in many cultures, “Ibn Sirin” is synonymous with dream interpretation.
Important Clarification: Historians note that Ibn Sirin did not personally compile a book called Tafsir al-Ahlam al-Kabir. Instead, the book we know today is a collection of his teachings, sayings, and interpretations, gathered by his students and later scholars, particularly in the 9th and 10th centuries Islamic calendar. The text synthesizes Ibn Sirin’s methodology with that of other giants like Imam Ja’far al-Sadiq and Imam Nablusi. If you are determined to obtain a digital
Seeing Prophet Muhammad (PBUH) in a dream is always true and brings glad tidings. Seeing Musa (Moses) might indicate conflict with an enemy. Seeing Yunus (Jonah) suggests being trapped and then saved.