Many websites hosting these "fixed" legacy files are ad-farms or phishing sites. The download button often leads to adware or survey walls rather than the actual file.
Lion 10.7.2 is over a decade old. Many hosting sites offer DMGs via unreliable BitTorrent seeds or broken HTTP links. A single flipped bit in the 4.37 GB file can make it unmountable. mac os x lion 1072 dmg file fixed