There are 2 methods for Terraclassifieds update.

Method 1

You can just click Update in your plugin's list. This button will be visible as soon as the new version will be available.

Method 2

You need to download the recent version of TerraClassifieds plugin here.

Then just unzip this package and run your favorite FTP client.

Navigate to wp-content/plugins of your Wordpress installation and just override terraclassifieds directory using extracted earlier package.

That's it. You have the latest version.