It is basically installed just like a standalone version of VPX.
You would copy and overwrite when asked.
Remember this is a Beta version. There are still bugs that need fixing before it is released to main public.
(That is why it is called Beta version.)
You can find more info here in the Beta topic, and find github link to newest version
(I would not use the version in above post attachment as it is outdated)...
https://www.vpforums.org/index.php?showtopic=44135&page=1