If there is a previous version of the plugin already installed, you should deactivate and uninstall it before you proceed with installing a new version.
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Log into your OpenCart Administration page.
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On the sidebar, go to Extensions | Extensions.
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Scroll down to OpenCart Elavon Converge EU Gateway and click Uninstall.
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After uninstalling the plugin, you must remove all plugin files from your server. (There is no easier way to do it currently).
- After uninstallation & removal of all plugin files from your server, proceed with the same steps as a New Installation to upgrade to a new version of OpenCart.