If you only want Halo CE gameplay on PC without MCC, the older exists on CD/DVD or MyAbandonware (abandonware, but unofficial/not verified for security).
For nearly a decade, this remastered version was trapped on Xbox consoles. The "PC download" became a reality only with the 2019 announcement of The Master Chief Collection (MCC) for Windows. Beta Testing (Flights) halo combat evolved anniversary pc download verified
The game includes several new features and improvements based on community feedback, such as tweaks to the user interface and game settings. If you only want Halo CE gameplay on