If you have already purchased a LiteSpeed license you can install LiteSpeed by doing the following:
To install LiteSpeed:
Download the autoinstaller for cPanel:
cd /root
wget http://www.litespeedtech.com/packages/cpanel/lsws_whm_autoinstaller.sh
chmod a+x lsws_whm_autoinstaller.sh
Run the installation command:
./lsws_whm_autoinstaller.sh [your license key here] 2 0 [your preferred admin username for LiteSpeed here] [your preferred admin password here] [admin contact email here] 1 1