Sadly, only a paperback version of China harayeko manche is available in Amazon. You can read more about this autobiography at Amazon here http://amzn.to/14PqDt9
So far we don’t know about any official pdf version. However, if you find any pdf or soft copy or audio version of China harayeko manche then it would be illegal copy, according to the copyright page in the autobiography itself.
Personally, I would love to have audible version (sadly none of the Nepalese novels yet available in Audible)
हरिवंश आचार्यको चिना हराएको मान्छे अब अम्याजनमा – China Harayeko Manchhe available in Amazon http://amzn.to/14PqDt9