It will ask you to locate DARKSOULS.exe in your DATA folder. Run the Daughters of Ash 'one-click installer' by double-clicking on it.Do not close the window until the prompt indicates that the process has finished. Run the UnpackDarkSoulsForModding.exe by double-clicking on it.Download and place the EXE for UnpackDarkSoulsForModding in your Dark Souls DATA folder.Download the Daughters of Ash 'one-click installer' from the Nexus Mods page.
NOTE: It is recommended that you start with a fresh installation of Dark Souls: Prepare to Die Edition before trying to install this mod.