There are lots of different editions and adaptions of John Bunyan’s Pilgrim’s Progress. (My kids especially enjoy the musical by the youth of Covenant Life Church.) But the classic book-length adaption for children is Eerdmans’s Dangerous Journey: The Story of Pilgrim’s Progress. The language of the original is retained, and the illustrations are plentiful and imaginative—accurate enough that this book is probably not best for the youngest kids.
You can watch below this version being read with its illustrations (nearly 2 hours long):
