You can download the latest version of FF RK MOD APK from our website with direct links. Just click on the download button down this page. After completing the downloading process, you have to check your phone settings so that "Unknown sources" are enabled in order to access the downloaded files.
(To check this option go to Settings > Security or Settings > Applications / Unknown sources on your phone.) Now, you can install the FF RK mod APK on your smartphone with no restrictions.