I decided to pick up FA:NV Ultimate Edition again for another couple of playthroughs. After re-installing it to my Xbox (I had deleted it earlier) I started another game. About 10 levels later, I was doing the quest 'I Put a Spell on You'. When I attempted to board the train to disarm the bomb, I found that my access was blocked. I double checked and I knew that this was the point I was supposed to disarm the bomb.
I decided to uninstall, delete, and reinstall FN:NV. After playing some more, I ran into more glitches. The most annoying of which is the Legionary Assassins running away while shooting at me (It's really funny, but it's kinda game-breaking.)
I decided to see what was up and recalled that I had not been prompted to install updates either of those times. Could someone help me?