So, finally installed Halo 5. After the installation, it said that I had 50-something GB in the Games and Apps screen, but now it says that there’s 0 GB. I can’t launch it at all, even though I’m offline. I’m really annoyed right now because this installation took all day, now it just removed itself from my Xbox. please help me
Same thing happened to me 
Restart your xbox and see if it still shows 0 gb.
Mine remained it my queue even after download. So worst case scenario do what I’m doing and just uninstall and re-install.