Welcome to the forum.
Downloading software (even old software) without the consent of the copyright holder is illegal. We don't allow links to those sorts of downloads here. Sorry.
You could check out
Beneath a Steel Sky, which was made by the same company as the Broken Sword games and released as a free download a few years ago.
Otherwise, I'm afraid eBay is your best (legal) bet for finding the Broken Sword games.
