There are many malicious sites that mimic OptiFine (often using similar names like "OptiCraft" or "OptiFineDownloads"). To ensure your computer's safety:
: The network has historically updated its Survival and Creative servers to support major Minecraft versions. opticraft 117 download new
: Open your launcher and search for "OptiCraft" in the modpack browsing section. There are many malicious sites that mimic OptiFine