Using a cracked license key is software piracy. While individual users rarely face lawsuits, you are violating the software's End User License Agreement (EULA). For business or educational use, this could have serious legal repercussions.

Do not try to download directly from the browser alone. The companion app can "rip" the stream at the original encoding quality (H.264, H.265, VP9) without re-encoding, which degrades quality.

The developers of Video DownloadHelper (MG1 Software) are very active. They maintain a server-side blacklist for stolen or leaked keys. If you find a key online, it has likely been used by thousands of people already. When the software phones home, the key is rejected, and you will be locked back to the free version—or worse, the software will stop working entirely.