So, I own the disc version of MCC and yesterday I bought the Halo Reach Campaign add-on. I successfully purchased the add-on and microsoft says I own it, but when I try to install it, it says installation stopped because it says the add-on is corrupted. It tells me to uninstall the add on and try again but there is nothing to uninstall. I have restarted and hard reset my Xbox but nothing has worked. Should I uninstall and reinstall the full MCC game? It is very strange since I bought ODST last week and had no problems. Any advice would be really helpful.
Edit: I apologize for the mis-intended notification. I thought I had the solution, but I gave useless info. I do know a lot of other people are having this same problem. They have yet to find a fix. Hope you can get it working!
Some other people a while back had this same issue. You can find their discussion & solution in this link here.
The short version of it is that they, with the disk in: canceled the installation (if it was still going), went to the MCC on the Microsoft Store, and installed the add-on from there, rather than from the game itself.
If you’re finding that it’s still not working, I can try to find more.