For educational purposes only.
Repack groups known for balancing size and visual fidelity include: crysis highly compressed download high quality
If you buy the game legally on GOG (Good Old Games) , you get a DRM-free installer. You can manually compress that installer using ArcThemAll or FreeArc yourself to store it on a USB drive. For educational purposes only
Downloading cracked or repacked games without purchasing them violates copyright law in most countries. Penalties can include fines or legal action from publishers (Crytek/EA). the files are uncorrupted.
If you want the authentic 2007 experience, the standard download on Steam or GOG is the way to go.
Before running anything, check the .md5 or .sfv file included in the download. Use a tool like QuickSFV. If the checksums match, the files are uncorrupted.