There is of Nuendo. Steinberg software historically requires a physical USB-eLicenser (Syncrosoft dongle) for activation. "Portable Free" downloads found online are often:
Steinberg Nuendo has long been recognized as one of the most powerful digital audio workstations (DAWs) for post-production, film scoring, game audio, and surround sound mixing. Version 4.3, released in the late 2000s, brought significant improvements in workflow, editing capabilities, and audio engine stability. Even today, some users search for terms like "Steinberg Nuendo 4.3 Portable Free Download" hoping to run this professional software without installation or cost. Steinberg Nuendo 4.3 Portable Free Download