How can I resolve this error message so I can query QuickBooks using QODBC's VBDemo?

I'm trying to use QODBC's VBDemo program, that is found in the installation folder, to connect to QuickBooks for the first time. I've been following QODBC's tutorial to achieve this.

At the end of the 'Running VB Demo' section, I get to the point where I select 'QuickBooks Data' from 'Machine Data Source' and click 'OK' before getting a Can't Open QuickBooks error.

There aren't many posts about this problem, but I've tried using Task Manager suggested by this person to close duplicate QB, restarted my computer, but the problem persisted.