- I’ve purchased Halo 5 on discSo can I have it on digital?
I don’t think so but I’m really not sure I’ll check for you and I’ll come back with an answer. 
By having a disc copy, you already essentially have a digital download, all the disc is for is to confirm you have the game (and the initial installation).
You won’t be able to get a free downloadable copy as well though just because you have the disc, otherwise you could just borrow the disc for a day from someone and get a digital download for free (cheating Microsoft out of money).
In some way you have to confirm you have the rights to play: either by inserting a disc, or signing into an account where the Xbox store knows you purchased it.
Halo 5: Forge on PC is available to download for free though if you want that.
Okay thx