Movierulz (and its various proxy mirrors like MovierulzHD, Movierulz Plus, etc.) is a notorious piracy website. It specializes in leaking copyrighted content—often within hours of a film’s theatrical release.
Legal status and copyright risk
Summary
The latest release is always at http://update.zeroturnaround.com/update-site/.
To install an older version, go to http://update.zeroturnaround.com/update-site-archive/ and select your desired version.
Nightly builds are available from http://update.zeroturnaround.com/update-site-nightly/.