Meaning new installations cannot be registered. Tacx have discontinued support of TTS4 and decommissioned the license server. While TDA offers some great features and superb video experiences, TTS4 still provides some value for those who had built up extensive libraries of videos, use the local-LAN multiplayer features and Zwift-like VR worlds. Tacx deprecated TTS4 in 2019 as they moved to their cloud-based RLV trainer software, TDA.
