First off, converting is not the correct term to be using. VDH does not convert a video, for
example from WEBM to MP4, unless you explicitly ask it to do so. The term you want to be using is
aggregating. It is during the aggregation step that the watermark is written. And there is a very
easy way to stop VDH from writing the watermark. BUY A LICENSE. Since the prospect of not having
a watermark is the incentive for buying a license, of course there is no way to circumvent this.
You may find this discussion informative:
https://groups.google.com/g/video-downloadhelper-q-and-a/c/AUQA23Jnmoo
Come on now. If you find this product useful, match your actions to your words. Buy a license,
like I & lots of other users have done. Support Michel's excellent work here.