cant install any halo mcc games on my pc

it is because its part of the halo MCC, you need the base part which is halo MCC then the individual games so it reserves space for them, halo 1 on pc for instance is 8.58GB and then add on the MCC base game it becomes 30.08GB.

halo mcc consists of all the games which take 142GB of space on pc so it saves this space aside, when you install hmcc and just one of the games which is also split into multiplayer and campaign it looks like it still reserves the space, this is what i have seen on xbox and gamepass pc, when i install via steam and just choose one of the games to be installed then the space taken is just by mcc and that one game.

I also have the halo guardians xbox and i cant install halo mcc or destiny, it did install spartan strike though

Have the hard copy of MCC since day one, installed nightfall code,halo channel, game, etc. I watched the first episode when it came out but ever since then for all the Nightfall episodes it says "buy halo".. I restarted my xbox, signed out and back in, uninstalled/reinstalled
halo channel, nightfall, and mcc, dont have a capture card, dont have any guests signed in or any of that BS and yes im using my account that i originally installed nightfall with and its STILL NOT WORKING!! And just when ithought halo mcc couldnt get any
more broken.. Good job MS and 343 for making a ****** game!

MCC was down as there was an update giving PC owners Halo Combat Evolved Anniversary game playable now. Stay tuned for more such issues to indicate when the other halo games will release for PC MCC

on external macbook hard drive/dual boot) Did you figure any solution to this? i can install other games fine but when i try to install halo mcc it errors out at 4.8%

Unfortunately the issue is still unresolved. I have the same problem with Halo or any "Administrator approval required for installation" game. It would seem that Apple Mac + Windows 10 + Xbox Game Pass PC = Error 0x8007001f