Level editor sdl.dll problem

[Traggey]

these files must be put at the same folder with the .exe Amnesia executable

By .exe you mean the actual game itself right? I have it on steam, so I can't find any .exe, since I assume the .exe is what you click to play Amnesia on Steam in the Steam Library.

Putting it simply, I don't really know how to do that.

Normally you will find your amnesia/steam installation at.

C:/ProgramFiles/Steam/SteamApps/Common/AmnesiaTheDarkDescent

This is where the tools should be installed to aswell.