Hi,
Not the quickstart - it's enough to update only template files (templates/gk_technews directory - did you edit any file from this directory? If no, you can download the latest version gk_technews_J!3.zip, unzip it, connect to your server via FTP client and upload it to your templates/gk_technews),
If you modified any file from this directory, you have to compare which files are modified to keep your template file customization (modified code)
Plase remember about the full backup first!