The presented guide will be useful if you are using any version of OpenCart from 1.5 to the latest version. Here we are upgrading OpenCart 220.127.116.11 to the latest release (which is 18.104.22.168):
Before you initiate the upgrade of your application it is advisable to create a full backup of your website, containing both the files and the database associated with it and store it on your local computer just in case that for some reason the upgrade procedure fails.
The first thing you need to do to proceed with the upgrade of your OpenCart store is to download the latest version of the application from the official website:
The next step is to unzip the downloaded archive and place it in a folder of your computer that can be accessed easily. Once you extract the file and access the release folder you will see the Upload folder.
The basic action of the upgrade of the application is that all the files need to be replaced, except the following two:
Next you need to upload and replace all the files from the upload folder to your OpenCart root folder using an FTP client of your preference. Such one is FileZilla.
Once you upload and overwrite the new files you will need to go to the install folder which is available at:
You will see a page with upgrade instructions. Click Continue:
You will need to wait a bit until the Progress bar is full. Then click Continue once again:
Clicking the Continue button will finalize the upgrade and you will see the upgraded applications, frontend. Once you access the dashboard you will see the new version is displayed: