While Epic will be moving to IRIS, I don't think they are starting customer migrations just yet. Because Epic supports specific versions of Cache, Epic distributes those versions. Your DBAs don't download Cache from the WRC, they download it from Epic. Your DBAs can get it for you. Epic doesn't run on Windows, but they do distribute the Windows versions for people to do what you're tying to do.
While Epic will be moving to IRIS, I don't think they are starting customer migrations just yet. Because Epic supports specific versions of Cache, Epic distributes those versions. Your DBAs don't download Cache from the WRC, they download it from Epic. Your DBAs can get it for you. Epic doesn't run on Windows, but they do distribute the Windows versions for people to do what you're tying to do.