This is the duty of root/admin to do by running the following command.

Unregister RVskin App Configuration.

# /usr/local/cpanel/bin/unregister_appconfig /root/rvadmin/appconfig/rvskin_cpanel.conf

# /usr/local/cpanel/bin/unregister_appconfig /root/rvadmin/appconfig/rvskinmanager.conf

# /root/rvadmin/uninstall.pl

Unregister RVglobalsoft Manager App Configuration.

# /usr/local/cpanel/bin/unregister_appconfig /usr/local/rvglobalsoft/rvglobalsoftmanager/auto/appconfig/rvglobalsoftmanager.conf

# rm -rf /usr/local/rvglobalsoft/rvglobalsoftmanager/

Remove RVskin2

rm -rf /usr/local/cpanel/base/frontend/rvskin2

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Remove RVskin from paper_lantern

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Remove the icon the this file:

 /usr/local/cpanel/base/frontend/paper_lantern/dynamicui/dynamicui_rvskin_theme_changer.conf

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Got cPanel webmail error in paper_lantern after RVskin uninstalled?

The solution is here.