I dont know if it is a bug, but my FRD doesnt ask for captcha (i think just for ORON) anymore, it says ERROR - ReCaptcha key not found. Can it reversed to previous state?

I couldn't download from 'ORON' usig FRD for about last 1 year.

I just checked the oron plugin, seems to be working.
(FRD asked me for captcha code, then began to download the file.)

Can you give more details? (oron file link as well)

Make sure you're using the latest version of FRD and the plugin.