I purchased a physical copy of MCC for Xbox One. I understand that it has been massively updated since the original release, so updates will be available. The system is insisting that I download a 73GB update in order to launch the game at all. This is a problem, as I’m one a “metered” broadband connection that allots me a limited about of download data and charges me extra when I go over that limit in a month. 73GB will definitely take me over than if I do it inside of any month. I’ve read that, for people who had purchased and installed the game prior to the 4K update, the game would allow you to download and install the update for individual games (Halo: CE, Halo 2, etc.), rather than the entire collection all at once. Is it possible to install the game new with that functionality?
Hey OP, it does sound daunting to have to download then entire 73GB but don’t worry as you don’t have to do it all at once 
Part of the MCC update was introducing a new feature called Intelligent Delivery. By default, MCC will attempt to install the entire ~70GB package. However, once the game displays “Ready to Play”, you can launch the game and access the Intelligent Delivery settings to customization your installation specifics. You’ll find Intelligent Delivery configuration in the main menu via the “Options & Career” page under “Settings”.
It’s an opt-out process so you can choose what parts you don’t want to install just yet and download them at a later date. If you need any more help, there are some screenshots in the MCC Update blog that might help: https://www.halowaypoint.com/en-us/news/mcc-update