For starters I’d check the subscription, does it need renewing?
What version of Dugi Installer are you using?
Take a look at this guide by football Guide manual installation guide by football.
When you open the DugiInstaller ensure that you click on Settings button and check that you have your Username (not email) and Password entered correctly in their appropriate fields.
If you use both, click on Auto Detect Paths.
If you don’t use Classic, tick the Ignore Classic check box and then click on Auto Detect Paths.
If you don’t use Retail, tick the Ignore Retail check box and then click on Auto Detect Paths.
This saves the program prompting with errors if it can’t detect an installation.
I am only trying to help, otherwise make a ticket here