You can find digital versions or summaries of this biography on platforms like Scribd or through the Yogiraj Kriya Yoga official site. Essay: The Householder Yogi
Also, check for a "Preview" version. Sometimes, the entire book is not free, but the preview includes the first chapter (the story of his meeting with Babaji in the Dangs Forest). Purana Purusha Lahiri Mahasaya Pdf English