When I try update Minecraft to 1.8.4 it downloads everything except for "realms-1.7.14.jar" it gets to almost the end and fails.

Put the summary of the bug you're having here
When I try update Minecraft to 1.8.4 it downloads everything except for "realms-1.7.14.jar" it gets to almost the end and fails.
What I expected to happen was...:
Describe what you thought should happen here
It would finish download successfully and let me launch the game.
What actually happened was...:
Describe what happened here
"realms-1.7.14" almost finishes downloading a fails.
Steps to Reproduce:
1. Press the Play button
2. Wait for it to download
3. It fails