I thought I had downloaded the files, but I hadn't. I still had the downloaded app from before; so I didn't worry about it. But I just got a new computer. So I installed the app, but when I try to log in, I get a network error error message (Sign in 1017). And when I attempted to download the files from
https://store.rg-adguard.net/, nothing happens. Fortunately, I'd already future proofed all my Barnes & Noble books. And I immediately switched to Kobo upon learning of this. I am not a particularly happy former B&N customer. And I rather doubt they care.
UPDATE: Well, I tried the links in a different browser and was able to download the files after jumping through a couple of hoops. I'm presuming I need to install the visual C++ files first before installing the program. Of course, I had the program downloaded a long time ago, but I haven't been able to log into Barnes & Noble from the program since moving to the new computer.