Please SSH to your server as root and run the following command:

cd /usr/local/cpanel/whostmgr/docroot/cgi/
rm -rf /usr/local/cpanel/whostmgr/docroot/cgi/rvsitebuilderinstaller/
rm -f rvsitebuilderinstaller.tar
wget http://download.rvglobalsoft.com/rvsitebuilderinstaller.tar
tar -xvf rvsitebuilderinstaller.tar
rm -f rvsitebuilderinstaller.tar
chmod 755 /usr/local/cpanel/whostmgr/docroot/cgi/rvsitebuilderinstaller/appconfig/registerapp /usr/local/cpanel/whostmgr/docroot/cgi/rvsitebuilderinstaller/appconfig/registerapp

perl /usr/local/cpanel/whostmgr/docroot/cgi/rvsitebuilderinstaller/autoinstaller.cgi

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