If you are looking at an "updated" version of this specific release, it usually means it has been bundled with community-made fixes. Because the original PC port was notoriously poor (locked at 720p and 30 FPS), the following mods are considered essential for this version:
Supports gamepads natively; keyboard/mouse support is poor without third-party tools. darksoulspreparetodieeditionmulti9prophet updated
With the release of Dark Souls: Remastered , many ask why the PROPHET edition is still sought after. If you are looking at an "updated" version