Verify Installation without Re-downloading the ENTIRE game

If I un-install and re-install does it mean re-downloading the entire game?

as the xbox replaces files while they are downloading updates it does not have the ability to verify files if you stop or cancel, so if you cancel the update it renders the game useless and you have to re download the entire thing.

On Xbox One, the entire game must be installed to the system from the Blu-ray game disc. Once it is installed, the disc is only accessed to verify ownership.

On Xbox One, both the digital downloads and the discs are exactly the same size. It's actually a rather neat feature of the system. If a friend installs their game from disc on your system, then when they go, you buy the digital version, there's no download
as the game already installed is simply unlocked to run without the disc verification. Very useful if your Internet connection isn't too snappy.

There is no error code. Just offers an update but downloads the entire game all over again.

That error code looks like a corrupted install. Just go into the game options. Under Files tab, click "verify and reapir".

Hi!

Verify that the additional contents are correctly installed using the "Manage Game" function. If not, you should uninstall the game and re-install it
again.