Note: Ensure you have first upgraded the site to a package that suits its needs by doing the following.
Login to your WHM.
Under account functions click Upgrade/Downgrade an Account.
Select the domain you wish to make the changes on and click Modify.
Select the package you wish the domain be upgraded to and click Upgrade/Downgrade
Still having the problem? cPanel doesn't recognize the update immediately. To expedite the process:
Login into your WHM.
Click Limit Bandwidth.
Give the site 1 MB of additional bandwidth.
Refresh the site in your browser.
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