Go to WHM(root) -> Plugins -> RVglobalsoft Manager -> Theme Manager.
On the Manager homepage, if you are not on the latest version, it will show you the link 'Update to latest version'. Click the link to update your RVskin version.

If you prefer doing on SSH, you can run the following command.

rm -f /usr/local/cpanel/Cpanel/rvversion
perl /root/rvadmin/auto_rvskin.pl

Or
perl /root/rvadmin/auto_rvskin.pl --force