In order for you to play Catherine Classic on Windows with minimal graphics settings, your computer must meet the following requirements
OS *:
Microsoft Windows 7 / 8 (8.1) / 10
Processor (CPU):
Intel Core i3 (2.9 GHz) or AMD equivalent
Memory (RAM):
4 GB RAM
Graphics Card:
DxX10 compliant video card with 1 GB VRAM (Nvidia GeForce 8 Series or higher AMD RadeonHD 4870 or higher Intel HD 2000 or higher
DirectX:
Version 9.0c
Storage:
20 GB available space