The best modern repacks are "lossless." This means that once the game installs and decompresses on your hard drive, all original textures, audio tracks, and cinematic cutscenes are restored to their full, uncompressed quality. System Requirements
Legitimate Alternatives and Best Practices For Players:
The files must be decompressed (extracted) back to their original size during installation. This process demands high CPU and RAM usage. Lossless vs. Lossy Compression
Fast downloads allow you to keep the installer archived without hoarding gigabytes of space.
Once finished, turn your antivirus back on, whitelist the game folder if necessary, and launch the game from the desktop shortcut. Risks of Downloading Highly Compressed Games