The ($29.95 lifetime license) is completely clean. Furthermore, version 5.9 includes an optional "Secure DNS" feature that routes download requests through encrypted DNS (Cloudflare or Quad9) to prevent ISP throttling based on file types.
"Browser extension doesn't capture YouTube videos." Solution: Update to the latest extension (v3.2.1). YouTube frequently changes its DOM structure. CyberPlanet 5.9 includes a manual "Grab Current Tab" button on the toolbar.