Clone or download the repository from https://github.com/Vuframe/vuframe-plugin-unity by clicking the green button "Clone or download" on the right side. If you download the repository it will unpack the Zip file in and empty folder and open the new created folder in Unity as a project. If you are using Git, clone the repository and open it in Unity as well. Pull from time to keep the Plugin up to date. If you are using another Version than Unity 4.7.2, Unity will prompt you a dialog, asking to upgrade the project. Proceed and upgrade it. Next Unity will ask you for an API update, proceed as well, by clicking on "I Made a Backup. Go Ahead!“. Finally, Unity will give you the message that a Layout could not be opened. Click on "Load Default" Layout. Congratulation, you are in.
If you want to have a look on some example scene, feel free to navigate in Unity to the folder "Example-scenes" and take a look at the three examples shipped with the Plugin.