If you encounter bugs, revisit the troubleshooting section above. And if you ultimately love the game, please support United Front Games (now defunct, but Square Enix holds the rights) by purchasing a legit copy when you can.
Downloading a "highly compressed" version of Sleeping Dogs is not recommended and is likely a scam or malware. Authentic versions of the game require significantly more storage space. Why 500MB is Not Possible If you encounter bugs, revisit the troubleshooting section