Hi there,
I contacted them and this is what they had to say:
"I don't think it came from our download. Our download server is RTG's and the package content is exactly the same as any other RTG, albeit with a different skin."
That makes sense to me. I don't believe you got the virus from downloading their casino, it had to have come from something else.
Otherwise we'd be hearing a lot more complaints when anyone tried to download any RTG casino...