I just want to download one Halo game

I just want to download halo combat evolved from xbox gamepass, but when I want to install it, I download all master chief collection games

If you’re downloading this from the MS Store on Windows 10 then I’m afraid you need to download the full game, it’s a limitation of the Microsoft Store unfortunately. It doesn’t have the “Ready to start” feature that Xbox has that would let you open up the menus and de-select the games you don’t want. Definitely worth passing feedback over to Microsoft about this - there’s an option in the store menu to send feedback.

I know when I downloaded it on Steam, it only came with Halo: CE installed. Once I opened the game I was able to install every other game.