DASH used to be available as part of the Cambridge Structural Database (CSD) software portfolio (within the CSD-Materials suite).
DASH moved out of the CSD Portfolio in late 2021 (no longer part of the portfolio from the 2021.3 CSD Release) and is thereafter available as an open source project on GitHub. See DASH Software - Moving To Open Source for more details.
Need more help? Contact CCDC Support.