Does vRoom work with the FPrime and Kray renderers?A.
it has been reported that these renders work fine with vRoom. Though this functionality is not guaranteed or supported.
Does vRoom work with HD Instance?A.
Unfortunately instancers do not allow vRoom to access the original object's ID and vRoom needs this to be able to scan the object and create the interior.
Can I make my own images to use in vRoom?A.
You can create them any way you like. There's nothing special about the format apart from the fact that it's an image of 6 squares, each one representing a wall, ceiling or floor. You can see examples on the image pack page. As long as they are in that format, it's doesn't matter how they are created.
Furthermore, in the free plugins section there is a plugin called 'probe unwrapper' and tutorial videos demonstrating it's use. You can use this to unwrap reflected sphere images straight into the vRoom format.