Do a search in here. Several have uploaded it to a website for download.
Or you can buy one off ebay. But beware they are pirated and illegal.
I bought one, and pitched it because it was a pirated copy.
Best to buy the real thing. Both to have it in front of us when working on the
Rinny and to avoid legal questions.
Anyone who can afford a $7000 quad can afford $50 for the manual.