If you want to upgrade Coppermine installed from Softaculous, just follow these steps:

Go to cPanel --> Softaculous --> Image Galleries --> Coppermine. Find your current installation and click on the Update icon.

If there is not any 'Update' button/link, this means that the application is up to date and upgrade is not available.

If you want to upgrade your Coppermine installation manually you can follow the instructions published in this detailed tutorial.

Please note that manual upgrades can cause database corruptions, data loss and break your script's functionality. You should always make a backup before upgrading an application.