If you have a legitimate copy of the game or are looking to fix your existing installation, the community has developed tools that are much safer and more effective than a random "crack":

The base game does not natively support 1080p or 4K widescreen monitors, often resulting in a stretched or letterboxed image. The Risks of "Cracks" and "Repacks"

Repacks often strip out cinematics or music to save space, which can lead to frequent crashes or a "broken" career mode.

Since NFS Carbon is nearly two decades old, it was designed for Windows XP and physical CD-ROMs. This creates two main issues for modern gamers:

Created by ThirteenAG, this is the gold standard for running the game on modern monitors. It fixes the aspect ratio and allows for high-definition resolutions.