Until OpenCart v1.4.7, we had to upgrade our system manually. Each new version included an upgrade.txt file to read first and apply upgrades manually.

For example, this is a screenshot from the v1.4.6 upgrade.txt file:

Now, starting from v1.4.7, we are able to use a universal upgrade script without opening the phpAdmin tool to execute the SQL scripts manually. The web based script supports upgrading from any version later than v1.3.0 to v.1.4.7 directly.

If we are using a version older than OpenCart v1.3.0, we will need to first upgrade all the versions in between until we reach 1.3.0. Then we can run this script.

Now, let's learn how we will use the upgrade script.