Agile Requirements Designer (ARD) 2.6 by default installs CodeMeter Runtime Kit v6.4. If we choose not to install CodeMeter with ARD 2.6, would it work with CodeMeter 5.21 that was installed as part of an earlier version like ARD 2.5?
Yes, ARD 2.6 will work with CodeMeter 5.21. However, it is always recommended to upgrade with the product.