Single-file HTML guides. Download them, open them in your browser, search them with Cmd-F. No email gate, no checkout. The same files I use myself when I'm in the work.
Each one is a standalone HTML file. Download it, double-click to open it in any browser, and it works offline. Print to PDF if that's how you read. No backend, no tracking, no expiration.
The Signal is the weekly version, and the Diagnostic is the version pointed at your business. Read the note when you want the wider lens. Book the read when the week keeps leaking in the same place.
Read them in the browser, print them to PDF, save them to a Notes folder, share them with someone on your team. No license you need to read. If one of these saves you a Tuesday afternoon, that's the whole point.