For the most reliable English versions of Ibn Hajar’s commentary available now, you can check:

Many Western universities with Islamic Studies departments (e.g., University of Chicago, SOAS London, Al-Maktoum Institute) have purchased institutional licenses for digital copies. If you are a student or alumni, log into your university’s digital portal and search for the ISBN of Volume 13 (Look for ISBN: 978-9960-892-60-3 for the complete set reference).

: Provides PDF summaries and biographical information about Ibn Hajar and his work.

Serious hadith scholars often share PDFs via closed academic groups. Join Telegram channels dedicated to "Hadith Sciences" or "English Islamic Books." Explicitly ask for Volume 13 only —many members have split the complete set into individual volumes.

However, a critical fact often confuses seekers: That set only includes the Arabic hadith text plus a very abridged version of Ibn Hajar’s commentary.

The Fath al-Bari English Volume 13 PDF contains several key sections:

For students of Hadith and Islamic scholarship, (by Imam Ibn Hajar al-Asqalani) remains the definitive commentary on Sahih al-Bukhari. The English translation, published by Dar-us-Salam, is a monumental effort, typically spanning 15+ volumes.