Thanks, both of you. I just upgraded from RX Elements with the $99 offer, so I need to find a training manual or something of the sort.
It is exactly two years ago that I began this thread, when I spotted on Amazon an announcement of a new book by Eric Kuehnl, "Audio Restoration with iZotope Rx 7," exactly the kind of manual I still (after more than a decade using various versions of Rx) would love to have, and seemingly what you would like as well. At that time, iZotope had not yet announced the introduction of version 7, but the book announcement had a detailed table of contents, a picture of an artsy book cover, even a page count (304pp), and a publication date of January 2019. I bought Rx 7 when it finally came out later in 2018, but the book publication kept getting delayed. In early April I spotted a listing on Book Depository for April 15, 2020 publication and ordered it. They charged my account, by the end of April it was listed as delayed to May 15. Finally last week, after no communications or explanations from Book Depository, I asked for a refund. I then wrote to publisher, Hal Leonard Books, who replied that they had sold the publication rights (along with other titles) to Rowman. An inquiry to Rowman got a brief answer: "I'm sorry but the publication was cancelled."
So, somewhere out there, there may be a manual. But no one seems to think it is worth selling it to us.
Jeff