That said, fan demand keeps the hope alive. If you want to see an official "Amagami SS game English exclusive download PC" one day, support the creators by buying official merchandise and streaming the anime legally on platforms like Crunchyroll. Sales figures speak loudly.
Here is some important context: In 2009, Enterbrain actually released Amagami for exclusively in Japan (Windows XP/Vista/7). This PC version—often called the Amagami Standard Edition —featured higher resolution sprites (1280x960) and faster loading times than the PS2 version.
Download the emulator (version 1.7 or newer). Configure your controller (Xbox or DualShock recommended). Load the patched ISO. Because the game is a 2D visual novel, even a low-end laptop (Intel HD Graphics or better) will run it at 1080p with perfect frame rates.
Because this is an older game (2009/2011 engine), it runs on virtually any modern Windows PC.