RVsitebuilder will be installed on /var/cpanel/rvglobalsoft/rvsitebuilder (for cPanel server). You need to have at least 2.0 GB space available. If /var is running out of space, you can solve it by creating symbolic link from /var/cpanel/rvglobalsoft/rvsitebuilder to other partition. Let's say you want to move RVsitebuilder files to /home. You need SSH to the server as root and run these commands.
mv rvsitebuilder /home/
It will take 10 - 30 minutes depend on your server performance. Please wait and don't stop it while moving files. After successfully move files, run this command.
ln -s /home/rvsitebuilder