If you have any questions whether or not you are on a supported version of Macromedia software you can see the following page: http://www.macromedia.com/support/programs/supported_products.html
The page reports that Flash Remoting is supported for the MX version, but does not mention Flash Remoting 2004. Any thoughts?
Since Flash Remoting applies only to the server portion (flashgateway.jar or .ear) we still support the latest version which is MX. You are right though that it is confusing if we support SWF files built in Flash 2004. We do support it and here is a link to download the components http://www.macromedia.com/software/flashremoting/downloads/components/