Even if you manage to find a legitimate, safe archive that has been heavily compressed using KGB Archiver, the decompression process is incredibly demanding.
If you were to proceed with this, here's what the process would typically look like:
Please note that downloading copyrighted content through torrent sites or file-sharing groups may infringe on intellectual property rights and potentially pose security risks to your device.
The Truth About Batman: Arkham Asylum PC Game Highly Compressed KGB
Some games ship with massive "dummy" files or uncompressed video files that can be easily crushed by compression algorithms. However, Arkham Asylum utilizes the Unreal Engine 3, which already packages its assets efficiently. You cannot compress 9 GB of complex game code and unique 3D assets down to 100 MB without losing data. 3. Malware and Phishing Hazards
Many sites offering "highly compressed" games are not official, increasing the risk of downloading malware or viruses. Batman Arkham Asylum PC Requirements (Official)