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Releases are maintained at GitHub. The full list of releases beginning with 4.2.0 is available at https://github.com/esdscom/sdscom-xml/releases.
Former SDScom Releases (prior to GitHub)
The following covers just the latest of SDScom version 4.0 and 4.2. There never was a version 4.1, and version numbers prior to 4.0 were assigned to its predecessor EDASx.
SDScom XML version 4.2.3
SDScom XML version 4.0.3
This version was published before release management moved to GitHub, thus is not available there.