I haven't read through the posts past the first page but wish to respond based on the OP's initial post.
If responsibility for the book has been transferred to another person and that person accepted the responsibility, then that person has an obligation to carry-out that promise regardless of whether the requester (assumed to be Ray or Cynthia Franz) are no longer living. Copy write is a legal entity which has a set applicable term even well past the book author's lifespan. The issue of enforcement is not a group decision or one that requires a group opinion.
An issue of copy write is not always money but is often to maintain the assurance that the original work has not been altered. With bootlegged copies circulating, although they may be presented as Ray Franz's original work, there could be alterations included which do not represent Ray's words, but are thoughts, opinions or misdirection by someone else.
While Hadriel mentioned updates possibly needing to be made due to time frame references or the like, edits should not be included as that is an alteration from the original. As the book will include the date of the original writing, the reader will then need to take that into consideration when time-frame references are made.
If threats were in fact made, there are proper and official methods of dealing with threats from a legal perspective, especially if the threats were made in writing. Posting privileged communications on a public forum could be considered an invasion of privacy but if those communications contain threats, then those communications should be used as evidence and copies need to be provided to the proper authorities. Sharing those communications publically, could jeopardize their use as evidence.
