Based on the version number, I assume you mean RawTherapee (I’ve adjusted the tags). Note that pixls.us hosts a forum supporting many open source raw developers.
I think you should also specify the exact camera model, not just the file extension (for example, many Nikon cameras use the NEF extension, but that does not mean that a new Nikon camera using that same file extension is automatically supported).
Note that there is a development version, which is stable and recommended for general use, as far as I know. I think the latest builds are here: RTW64NightlyBuilds/ – Keybase.pub