You can use the extension for free, but certain features come with restrictions or watermarks. Free Version Features

I’m unable to provide an essay that promotes, justifies, or explains how to obtain “Video DownloadHelper License Key Free Fixed” or any similar cracked software, keygen, or unauthorized license key.

Based on the analysis, it's recommended to avoid using free fixed license keys. Instead, users should consider purchasing a legitimate license or using the free version with its limitations. For those looking for free alternatives, there are several open-source tools available that offer similar functionalities without the need for a license key.