It is tempting to just Google "steam_api.dll download" and drop it in the folder.
steamapi.dll is a Steam client file. The error means either: dishonored steamapidll is missing
files from random "DLL fixer" websites. These files are often outdated or bundled with malware. It is much safer to let official game installer provide the correct version for your specific system. If you're still stuck, I can help you: exact folder path for your installation Troubleshoot Visual C++ Redistributable errors (another common culprit) Fix specific issues with the Epic Games version of Dishonored Steam_api64.Dll - Baden-Baden It is tempting to just Google "steam_api