Most "fixed" download buttons on third-party sites are scripts designed to install adware, spyware, or ransomware on your device.
Available in 4K and Dual Audio (Multi-language) on Amazon Prime Video , Apple TV , and Google Play Movies . What We Know About the Sequel
Downloading copyrighted material from unauthorized sources is illegal in most jurisdictions and can result in penalties from your Internet Service Provider (ISP). How to Watch "I Am Legend" Safely
If you want to catch up on the story before the sequel arrives, you can find the original I Am Legend (including the Alternative Ending) on legitimate platforms:
As of mid-2024, It is not yet available for streaming, digital purchase, or download.