After doing step 1 (verifying files), the error was gone for me. Hope this helps someone else!
Purchase the game on Steam (it frequently goes on sale for $2–$5). The legitimate version will never have this issue permanently. dishonored steamapidll is missing
If you are trying to launch Dishonored and encounter an error stating that steam_api.dll is missing , it usually means After doing step 1 (verifying files), the error
But don't reload a save just yet. This guide will walk you through to fix the "Dishonored steam_api.dll is missing" error, permanently. After doing step 1 (verifying files)