Hi @SC_94,
have a look at this post what you have to add: HTTP Connector in Camunda Run Distribution - #5 by rohanfarooqui
You can find the jars on maven central:
https://search.maven.org/artifact/org.camunda.bpm/camunda-engine-plugin-connect/7.16.0/jar
https://search.maven.org/artifact/org.camunda.connect/camunda-connect-connectors-all/1.5.2/jar
https://search.maven.org/artifact/org.camunda.connect/camunda-connect-core/1.5.2/jar
Hope this helps, Ingo