[@STUART] GrabTube actually has a built-in cookie setup wizard that runs on first launch. It detects your installed browsers, asks you to log in to YouTube, and verifies the cookies automatically with one click. If you skipped that step, you can trigger it again by trying to download any age-restricted or login-required video — a “Browser Login Required” popup will appear with 3 simple steps:
Open youtube.com in Chrome, Firefox, or Edge
Sign in to your Google account
Click “I’ve Logged In” in GrabTube
GrabTube reads cookies directly from your browser — no manual export needed. If Chrome isn’t working (Windows sometimes blocks cookie access due to encryption), try using Firefox instead — it works more reliably for cookie extraction.
Also make sure your browser is fully closed before clicking “I’ve Logged In,” as some browsers lock their cookie database while running.