A free update can be downloaded post-purchase to add VR support to this title.
1. Install the base game onto your Steam account. (How do I install my Steam key?)
2. Install the free Catlateral Damage VR DLC from the Steam store. (Link to DLC in Steam Store)
3. When you launch the game you will be prompted to select either the original version or the VR version.
(Further detail on this can be located on the following Steam page - Link to Steam article)