Download and install the latest packages directly from the Official Microsoft Website .
If you find steam_api.dll or sonic2app.exe , select and add it to your Exclusion/Exceptions list to prevent it from being deleted again. 3. Install Microsoft Visual C++ Redistributables steam apidll sonic adventure 2 upd link
If the .dll is missing from multiple games, the issue might be your Steam client itself. Reinstalling Steam ensures all core API files are updated and correctly registered in your system. Download and install the latest packages directly from