Follow the following steps:
1) Go to the link and select the download dile for debian package
http://flareget.com/download
or
In Terminal type sudo wget -c"www.flareget.com/files/flareget/debs/amd64/flareget_2.4-27_amd64(stable)_deb.tar.gz
This downloads .deb file for installing Flareget.
2) Double click the downloaded file and you will get forwarded to the Software centre and you will need to install from there. It won't take time to install because it is already downloaded .