Here's the scoop:
I'm running Windows 8.1 through Parallels 9 on my Mac Mini.
The root video for Mac didn't work for me either (so, I'm sorry).
ANYTHING and EVERYTHING I've tried so far, has come back with an error message.
And I have followed each video STEP-by-STEP.
(sorry, I had a Nexus 5 that sustained INTENSE water damage a few hours ago, so I'm already upset at the contrasting difficult between rooting both phones).
Please, someone help me out. Every video I've watched was posted almost a year ago.
I'm running Android 4.3 - and drivers aren't working on Windows 8.1.
Thank you so much to anyone that helps.