How to install a game to Steam from retail disc if you have also purchased a digital copy. To download the base or core game files off of Steam, seeing as you already have the core game files.

ANSWER:

If you own a disk version of a newer Ubisoft game (released after 2014) you can install it from disk or download the game through Uplay after activation. Inserting the disk should be enough to install the game without download. However, if you want to ensure you avoid downloading games, you may be able for force the installation of your game from the disk.
This is how:
Please note that the game may encounter issues - or not launch - if you do not download an install the latest available updates. To do so:

PSA: You can still install games even if your game disc is damaged by installing through the store.

This only works if the Xbox One sees the game but stops the installation partway through.

Open the store page for the game while the disc is in, stop the game installation, and then make sure the store shows the 'Install' button and not the 'buy' button. It will then download the entire game instead of installing the majority of the game off the disc and then downloading the updates.

Had to do this last night when my $10 copy of GTA 5 from eBay stopped installing part way through.

Edit to clarify instructions:

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1: insert disc. If the Xbox one sees it as valid, you should be good!

2: mash the hamburger button on the controller when you have the game highlighted on the home screen. It should bring up a menu and 'view in store' should be an option. Pick it.

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3: cancel the installation IN THE STORE. It should give you then option to Install. Do that. It will work.

Edit 2: this is the hamburger button

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