Simply install the client as this will be needed in order to issue the Dimensions commands, the plugin will check to see if DMCLI is in the path, if it is not available the build will generate an error.
In some instances, users are unable to access the Web Client and/or Admin Console in Dimensions 10.1. However, Serena Common Tomcat is accessible by using the base url along with other clients working, such as Desktop, DMCLI and DMDBA.