A colleague has now managed to integrate the plugin with his Katalon account in another Katalon Studio installation on a virtual machine running Windows 7. (But the problem with my account on my physical Windows 10 machine is still not fixed!)
However, on the other hand, we have the additional problem that when trying to edit the added Katalon field in a Jira issue, an error message appears saying several times:
Exception: Uncaught Error: Mode gherkin failed to advance stream.
The input cursor in the Katalon field blinks, but this cannot be filled in:
What else can be wrong with it?