If it is installed from cPanel support and receiving invoices directly from cPanel, I guess it is not Pro version but shared CloudLinux Shared license or I am wrong?
I see the following message
AccelerateWP is not available with your current CloudLinux OS license.
This feature is not supported with your current CloudLinux license (CloudLinux OS Shared). Please contact your CloudLinux license provider to upgrade.
What is the price to upgrade CloudLinux license using cPanel billing?