There are a couple of plugins you will need to have enabled. Fortunately these are built into UE4! You can find the plugin browser by clicking Edit>Plugins within the UE4 Editor.
Just enable the following plugins to get started.
Required Plugins
- SteamVR – This is needed to use SteamVR
- Steam Controllers – This is required if you are using Valve Index and I suggest enabling it in general for multiple controller support.
Required External Programs
- Make sure the Steam Client is always running (in background is fine, this is for development in editor as the controllers are linked to steam itself).
- Make sure SteamVR is running
You will need to restart the UE4 Editor.