Is there any freely available English translation of the Peṭakopadesa? I only have knowledge of Ñāṇamoli's translation which is not available for free. Does anyone have knowledge of an English translation available for free?
The Pali Text Society is about the best authority for English translations, and they did produce a reference text in 1977. There is not a lot of online translations, but here is a link to the digital version of the book:

http://lirs.ru/lib/The_Guide,Nettippakarana,Nanamoli,1977.pdf