This is the second time I am having to install this game I tried submitting a ticket but I couldnt find a relevant one for this.
I was updating the game to get the latest version and earn me the nameplates and it was at 1.02/1.03GB complete and the download failed and said there was a problem with the installation and it needed to be re installed. I exited windows store and re opened it and the install button was only listed for Halo MCC and it was not showing up in my xbox app to launch the game from.
Not sure why this has happened but I have a VERY slow connection and at times it drops to 1 - 6 kb/s so this takes a month to install and I am only at 500mb / 64.75GB again …