The latest modified Half Life VR Mod is created by Max Vollmer, but then edited and further improved by Rorin and now also the Source VR Mod Team (the guys that are currently working on a Half Life 2 VR Mod as you may already know). > How to start & play Half-Life: Blue Shift and Opposing Force DLC in VR If you don't want to watch the video, you can scroll down to the installation steps I added in text-form below. I made a video showing off how the Blue Shift & Opposing Force works and looks in VR, and from 08:35 into the video I'm giving you a simple step-by-step tutorial how you setup the latest Half Life VR Mod to work (including the solution for the issue with missing client.dll file), and how you do to get the expansions to work in VR as well.

Well, from start it didn't work with any of the VR mod versions, but after playing around for some time by just copying over some of the mod files, I found out that it's actually very simple to get those two Half Life 1 expansion packs to work in VR. I'm kind of in love with the VR support for Half Life 1 thanks to the recent VR mod updates, so I have been thinking that maybe the two DLC's Blue Shift and Opposing Force could work in VR as well.