Whenever I try to launch a campaign in MCC I just get a message saying “MISSING CONTENT. The following content is required:… Would you like to customize your installation now?” It says they are all installed but I get this message after a hard reset and reinstalling. Anyone know what’s wrong?
I have the same problem, i installed Reach and the others Halo ran, but i uninstalled and reinstalled and was worse, now nothing halo run for missing content 
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> I have the same problem, i installed Reach and the others Halo ran, but i uninstalled and reinstalled and was worse, now nothing halo run for missing content
Solved it actually. Set console to offline, and download off the disk. When the download is done then go back online to update. Worked for me.