The SolarWinds LicenseManager doesn't currently have any switched or arguments that you may include using the command line. If I am not mistaken the current licensing system requires that this application connects to the SolarWinds Licensing Server and removes the unique computer identifier from the list of active installations.
I suggest you put a Feature Request (Feature Requests) and indicate how you would like this application to handle multiple deactivations. Maybe suggest some sort of centralized licensing. Currently this tool is meant to work on a single machine at a time.