Before searching for a manual download, use Steam's built-in repair tool. It automatically identifies missing files and downloads the correct, official version for you. Open your . Right-click The Elder Scrolls V: Skyrim . Select Properties > Installed Files (or Local Files ).
This is the official and recommended method. Steam includes a built-in tool to check your game's installation and automatically repair or replace any missing or corrupted files, including steam_api.dll . skyrim legendary edition steam-api.dll download