Which would you like?
If you cannot find a free legal version, renting the movie costs between $2.99 and $3.99 USD. For the price of a latte, you get HD quality, no viruses, and support for the filmmakers. index of jack the giant slayer free
If you love swords, sorcery, and giant monsters, it is absolutely worth 114 minutes of your time. But is it worth the risk of downloading via an "index of" link? No. Which would you like