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Download the .ocmod.zip (either from OpenCart Marketplace, or Github and ensure you have the latest version number; unless you wish to downgrade) and upload it similarly to how you did while initially installing
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You will be prompted with a list of files that will be "replaced" (all will be files native to this extension; click Continue to proceed)
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Head to Modifications on the navigation menu -> DISABLE any previous versions of Abandoned Carts, while leaving the latest (highest version number) active - this will not disable the extension, but only the old codebase that is cached by the system.
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Also in modifications, clear cache (orange button, then blue button on the right)
You should now be upgraded to the latest version.