Hi Hannes!
If you want to install ABSConfig Tool, you need to install the Skype for Business 2015 Resouce Kit. For more details, you can refer to:
https://docs.microsoft.com/en-us/skypeforbusiness/management-tools/resource-kit-tools
The following link also shows Skype for Business 2019 Resource Toolkit for your reference:
https://greiginsydney.com/sfb-2019-resource-toolkit/
Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make
sure that you completely understand the risk before retrieving any suggestions from the above link.
Best Regards,
Jimmy Yang
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