Launch DARKSOULS.exe . The first run may take 10-15 seconds to generate GFWL emulated save data. Do not alt-tab.
For safety:
For collectors, modders, and die-hard fans who refuse to let the original Dark Souls PC port die, this Prophet release is the definitive offline version. Just remember: preserve it, learn from it, and consider supporting the official releases when possible. darksoulspreparetodieeditionmulti9prophet updated
While the PROPHET release allows for specific "classic" mods that aren't compatible with the Remastered version (such as the original Prepare to Die Again or certain lighting overhauls), Dark Souls: Remastered Launch DARKSOULS