No, nothing in the Junk folder. I've sent emails through the contact function on his website and, through my hotmail account, to firstname.lastname@example.org. No reply. Today, I saw the hardcopy version is for sale at Gryphon Strings, which is where he has taught in the past, so I emailed them at their "info" address, asking about him, but have not heard back.
I found the email I got when I made a PDF order in November 2021, and clicked on the "download" link, but I'm getting a "Failed - Network error" message even though the link isn't supposed to ever expire. Maybe it's a network thing that's messing up his orders and keeping him from getting emails. No idea.