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Environment/Versions TTworkbench 32/64 Bit, Microsoft Windows/Linux Answer In TTworkbench, go to the menu, Help > Install new software... > Add... > Archive..., browse, choose the downloaded zip file. Check TTworkbench features > Next > Confirm license agreement > Finish and restart at request. You can check the installation over Help > About TTworkbench > Installation Details > Installed software. TTplugin is a functional extension of TTworkbench. It can be used as    Codec  message encoding/decoding  Port  transport communication establishment  External function  reusing your library source  Timer  Re-implementation of timer behaviour  SUT action  Re-implementation of action operation in TTCN-3, a possible usage is to call API to SUT for fully test automation ... and other TTCN-3 standard interface implementation if needed.