Hey everyone!
I am truly sorry to hear about the issues downloading The Master Chief Collection. Before trying any troubleshooting steps, first make sure that your account region matches your physical location. You may experience issue purchasing and downloading content if you do not have the proper location information set correctly. Another idea to consider is to make sure that you have the appropriate amount of storage to download The Master Chief Collection, considering that the download will take up nearly 45 GB of space. If you need additional storage for the download, you can Uninstall any content you are not currently using. You can also use an external storage device for additional storage space, just as long as the storage device has a capacity of 256 GB or more and uses USB 3.0. If you double checked your account region and your storage capacity and are still experiencing the issue please give the following troubleshooting steps a try
First, from the Dashboard, navigate to My games & apps and then select Queue.
Select The Master Chief Collection and press the Menu button.
Select cancel to cancel the download.
Next, to ensure that your are not experiencing any connection issues, let's test your network connection.
From the Dashboard, press the Menu on your Xbox One controller and then select Settings.
Select Test Network Connection under the Troubleshooting Icon.
If you receive a connection error, follow the steps in our Xbox One Network Connection Error Solution page for further troubleshooting.
If you do not receive an error, navigate to Settings again and select Disc & Blu-ray.
Under Blu-ray, scroll down to Persistent storage and then select Clear persistent storage.
Once you have cleared the persistent storage, press and hold the power button on your Xbox One console for 10 seconds.
Once your console is powered off, unplug the power cord.
Wait 5 minutes and then plug in your console.
Power on your console and navigate to the My games & apps tile.
Scroll to the right and select The Master Chief Collection under the Ready to install section.
Keep an eye on the installation to see if you are continuing to see a drop in the installation percentage.
Once again, I am sincerely sorry to hear about the download issue, I can definitely understand how frustrating this could be. If the issue continues after trying the steps above please let us know, be sure to include all the steps that you have tried so that we can continue to help get this issue sorted. Thank you for your patience!