: Sites like the Epic Games Store occasionally give away commercial games for free on a weekly basis. Worms W.M.D on Steam
The search result you referenced, "worms-w-m-d-free-download-pcgamefreetop-net," points to a third-party website offering a free download of the game .
If you are looking for legitimate ways to play the game or other titles in the series:
: Games like Worms Zone are designed as free-to-play .io experiences available on platforms like CrazyGames .