RVsitebuilder CMS can be updated by website admin (your user) by clicking Update button from their website admin area. That will update all fixed bugs in RVsitebuilder 7 program.
Sometimes, RVsitebuilder cPanel plugin has to be updated for such as new features for server admin (placed in RVsitebuilder 7 Manager which will be coming soon), or bug fixes on Rvsitebuilder 7 on control panel.
Once a new changelog released and it tells fixed bugs for cPanel plugin, you can SSH as root and run the following command.
cd /usr/src; rm -fv rvsitebuilder7install.sh; wget http://download.rvglobalsoft.com/rvsitebuilder7install.sh; chmod +x rvsitebuilder7install.sh; ./rvsitebuilder7install.sh