LxB

I was having trouble with Contagion VR: Outbreak. I contacted the developers Monochrome Inc. and in response they have given me access to beta version. But unfortunately there is no way do so in Viveport. It is possible to update a game/app to beta version from within Steam, but since this is Viveport game, there seems to be no way to achieve this. Is there a way to achieve this, any work around ?