It can be downloaded from this link : http://svfonline.net/yoga-enlightenment-and-perfection.html#
This book contains a detailed account of intense spiritual practices of His Holiness Jagadguru Sri Abhinava Vidyatheertha Mahaswamigal, the 35th pontiff of Sri Sringeri Sharada Peetham, that culminated in HIS Enlightenment and Jivanmukthi at a very young age.
Am yet to read
the book in full, but a quick glance reveals that this is sure to enlighten an
arduous Seeker of The Truth.
Cheers!