Using the script from your web site.
i.e.
sudo python -c "import urllib2; exec urllib2.urlopen('http://calibre.kovidgoyal.net/download_linux_binary_installer').read(); main()"
Accepted the defaults.
The windows one was just the windows installer.
I have a licensed version of linux rar (rar labs version) installed, and can open rar files no problem using the gui tools.
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