First download RAR rpm package:
$ wget http://pkgs.repoforge.org/rar/rar-3.8.0-1.el7.rf.x86_64.rpm
2014-10-31 18:51:15 (58.6 KB/s) - ‘rar-3.8.0-1.el7.rf.x86_64.rpm’ saved [216008/216008]
This is a companion discussion topic for the original entry at https://linuxconfig.org/installation-of-rar-compression-utility-on-fedora-linux