This section provides an overview of what unity5 is, and why a developer might want to use it.
It should also mention any large subjects within unity5, and link out to the related topics. Since the Documentation for unity5 is new, you may need to create initial versions of those related topics.
Download and install the Unity Editor from the Unity Download page.
Installing Unity using Download Assistant
Unity Download Assistant is a small executable program which lets you select which components of the Unity Editor you want to download and install.