Once finished RVskin Installation at very first time, and found the following error in WHM:

WHM (root) -> RVskin -> Theme Manager -> Theme -> Global Configuration
LICENSE ERROR
Error message: license not found
Error code: 6

Or

ERROR : Not support Net::SSLeay

Or

In SSH

Validating package with SSL... Validating package with NONE SSL... Invalid.
Download with SSL ...
Error400 Bad Request
Error400 Bad Request
Failed.

Download is timeout.
Installation failed. Please rerun perl /root/rvadmin/auto_rvskin.pl to download files again.

Cause & Solution
Your server doesn’t have module Net::SSLeay to get passed license download.

Please try to run the following command to fix it.
/scripts/perlinstaller "Net::SSLeay"

You may try with force command if above doesn’t work.
/scripts/perlinstaller --force "Net::SSLeay"

After that, run install RVskin again: https://rvskin.com/rvskin/installation/