LOL. That's where I bought my new computer. They were useless! I'm not saying this is the cure all, but here were my steps, after retrying the download 7 times!
- Made sure there were no outstanding updates. Restrted my computer
- Turned off my internet connection while unprotected.
- Uninstalled McAfee completely
- Restarted my computer
- Turned on my internet connection
- Went to the Microsoft store and hit the Upgrade to 8.1 box
- Started the download
It worked!
I am using Defender for my security. I had great luck using Microsoft security essentials. Defender is the next iteration of that. I find the 3rd party security apps to be too invasive and too much resource overhead.