The mention of "LSFG 3" likely refers to a specific version or update of the Lossless Scaling software or a related tool that incorporates new features, algorithms, or improvements over its predecessors. While the exact details of LSFG 3 aren't provided here, such updates typically include:

is a paid software available on Steam (developed by THS). There is no official "free" (gratis) version of the latest Lossless Scaling with LSFG 3. Any website offering "Lossless Scaling download gratis" for the LSFG 3 version is likely distributing: