Once you have your ~1GB CHD file, playing it with actual extra quality requires specific settings in PCSX2.
: It uses an open-world, mission-based structure similar to Grand Theft Auto but focused on a boarding school setting. Visuals & Performance
If you're seeking a highly compressed version of the game to save storage space or for quicker download times, be aware that:
. While the prospect of a tiny download is tempting, these specific "highly compressed" versions carry significant risks and functional limitations. The Reality of "Highly Compressed" Files Malware Risks