OpenCart installer is a great tool to install new extensions on OpenCart. However, if you have modifications in the extension it could become difficult to update it.

Problem:

Unable to update an extension because ID already exists.

Solution:

To update your extension using opencart installer follow this steps:

1. Go to Extension > Modifications
2. Remove the extension you want to update
3. Go to Extension > Installer
4. Update your new version of the extension
5. Click on continue when the list of files show up
6. Go to Extension > Modifications and hit refresh just to make sure

That’s all, I hope it can help you.