One of those two sites is distributing adware. Which of them?
File Converter (FOSS) by Adrien Allard was hosted on file-converter[.]org since a decade. Then someone a few weeks ago snatched that domain and it’s now distributing adware. Almost identical design for the page, 100% designed to deceive users to download a different product, as it’s called Zamzar.
This is why I refuse to use any download buttons on websites for FOSS apps; if it’s FOSS, it has a link to the source, which has releases, and is the safest way to ensure you’re getting what you actually want.