Microsoft has made the installation process for Visual Studio very simple. Just be warned that it can take a while to download and install it:

1. Navigate to h t t p ://w w w . v i s u a l s t u d i o . c o m /e n - u s /v i s u a l - s t u d i o - h o m e p a g e - v s . a s p x .

2. Click on Download Community 2015; this is a free version of Visual Studio that works well with Unity and the HoloLens environment. By default, you should be installing at least Visual Studios 2015 Update 3.

3. Run vs_community. exe and complete the installation process.
4. Create a Microsoft Developers account (this is a requirement for the HoloLens development).
5. The first time you run VS2015, you will be prompted to input your account credentials.