A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate
in the Unity community.
EDIT - After changing the folder path to no longer include spaces(ie from "C:\Unity 5.5.0a1" -> "C:\Unity5.5.0a1"), it works!
Disclaimer - This is my first time posting to this forum, if this post is in the wrong area please let me know.
Lately I've been...