: Attempting to download individual DLL files from unofficial websites is a significant security risk and often fails because the version of the DLL must precisely match the version required by the Steam Client. Best Practices for Resolution
Wait for Steam to scan and re-download the missing steam-api.dll file. 2. Check Antivirus Quarantine Steam-api.dll Grid Autosport
Understanding Steam-api.dll and Grid Autosport: Fixes, Functions, and Safety : Attempting to download individual DLL files from
Restart Steam if an update is applied, then try launching the game. 4. Reinstall the Game Completely Steam-api.dll Grid Autosport