4ganizer checks a track's real release year by "listening" to it and comparing it against a giant free music database (AcoustID). To do that lookup, it needs one free code from that database — a one-time, two-minute setup. Here's exactly how.
If it asks you to log in, you can sign in with your Google account — or create a free account with an email address. There's nothing to pay.
The page will offer two options that look similar. You want the one that says register an application — not the one about a "user" key.
It'll ask for an application name — type anything, e.g. 4ganizer.
Everything else on the form is optional. Click Register.
You'll now see a short string of random letters and numbers, something
like ihP29rN4. That's your code — click and drag over it
to select it, then copy it (⌘C on Mac, Ctrl+C on Windows).
Open 4ganizer, click Settings in the sidebar, and paste your code into the box under "Year verification." Click Save. That's it — done.