Comments from DrakeImmortalis on the Kickstarter thread indicate that the Interstellar main rulebook was supposed to be 56 pages, but the PDF linked to on update 29 contains only 48 pages; the majority of the endnotes are missing.
Is a 56 page 3rd edition rulebook available anywhere?
Are the Living Rules available anywhere other than Yahoo Groups? (I don't think I can access Yahoo Groups files because I decline to give Yahoo a phone number to create an account; if this is wrong, please correct me!)
(edit: corrected "Interstellar" to "main", thanks Paweł)
I can't answer your question as no rules files have been shared with me. It's possible that the last 8 pages contain endnotes, someone told me that they had been left out. What is the link to the 48 page version?