The WebAPI war file can be downloaded from the OHDSI nexus repository, using a URL in the following format:
https://repo.ohdsi.org/nexus/repository/releases/org/ohdsi/WebAPI/<release#>/WebAPI-<release#>.war
For example, if the WebAPI release number was “2.10.0”. The download link would be:
https://repo.ohdsi.org/nexus/repository/releases/org/ohdsi/WebAPI/2.10.0/WebAPI-2.10.0.war