Yes, Oracle have changed the URL again.
I’m going to setup a redirect so that I can point JavaRa to SingularLabs’ servers, which will then automatically download the correct the file.
The URLs are: (may not be active yet)
http://singularlabs.com/download/jrex86/latest/
http://singularlabs.com/download/jrex64/latest/
An updated version of JavaRa containing these changes will be released within the hour.