Because the term "updated" implies a modern publisher's edition, you can find legitimate PDFs from:

Kumbhaka Paddhati is a classical pranayama manual focused on kumbhaka (breath retention) techniques within the yogic breathing tradition. An updated PDF edition typically includes revised instruction, clarified sequencing, safety guidance, and contextual notes for modern practitioners.

Ancient texts use complex time units (Matras). An updated version translates "16 Matras of Puraka, 64 Matras of Kumbhaka, 32 Matras of Rechaka" into seconds for a beginner, intermediate, and advanced practitioner.

: Known for publishing critical editions of rare Hatha Yoga texts like the Kumbhaka Paddhati. step-by-step guide