I can imagine the hurdle you've been through when trying to fix the errors in QuickBooks Desktop, @Bokihein.

For the error 1328 you've encountered, you'll want to follow the troubleshooting steps provided by my colleague, JoesemM, above.

I also appreciate the new screenshot you've added to get me on the same page. Since you've also encountered the error 1603 while installing the QBDT, we can first download the  QuickBooks Tool Hub as an initial step.

Then, use the QuickBooks Install Diagnostic Tool. Here's how: 

1. Open the QuickBooks Tool Hub.
2. In the tool hub, select Installation Issues.
3. Select QuickBooks Install Diagnostic Tool. Let the tool run. It can take up to 20 minutes.
4. When the tool finishes, restart your computer.

If the issue persists, you can follow Solutions 2-4 in this article: Fix Error 1603 when you install QuickBooks Desktop. 

Although this article is for the US version, the steps are similar to South Africa.

Moreover, I'll add this article again to get different QBDT tools to help fix problems and errors: Fix common problems and errors with the QuickBooks Desktop Tool Hub. This is also a US article but still applicable and functional to your company.

I'm still ready to back you up if you need more help managing your files. I'll keep the thread open so you can comment back.