If you legitimately purchased VDH and see "invalid key":
While the free version handles basic tasks, the premium license unlocks critical functionality for heavy users: License Key For Video Downloadhelper
Sites claiming to offer free keys often distribute malware, spyware, or ransomware that can infect your computer. If you legitimately purchased VDH and see "invalid
Video DownloadHelper is a popular browser extension that allows users to download videos from various websites, including YouTube, Vimeo, and more. It's available for Chrome, Firefox, and other browsers. and more. It's available for Chrome
Convert video files directly into MP3 or M4A audio files seamlessly.
: Full functionality for the companion app's video and audio conversion features requires a lifetime license. YouTube Support