Assuming you have found a reputable repack of Dark Souls: Prepare to Die Edition (v1.0.2.0), here is how to install it safely.
Fix: The original Dark Souls PC port is notoriously bad. Install DSFix mod and set renderWidth and renderHeight to your native resolution, but set internalResolution to 720p. Also disable Anti-Aliasing in-game. Dark Souls Pc Game Download Highly Compressed
The beauty of Dark Souls 1 is that it is not a demanding game by modern standards. Even a highly compressed version will require the same hardware to run smoothly. Assuming you have found a reputable repack of
Do not play this game without installing DSFix (Dark Souls Fix). The beauty of Dark Souls 1 is that