Twinmotion 2016 System Requirements -

Additionally, the OS requirement of Windows 7 64-bit (or later) hid a crucial detail: DirectX 11.1 feature level support. Twinmotion 2016 did not support DirectX 12 or Vulkan. This meant no asynchronous compute, no multi-GPU explicit adapters, and no ray tracing. The software was locked into a feature set that favored raw shader throughput over advanced scheduling. On modern (post-2016) hardware, Twinmotion 2016 could not leverage new GPU capabilities like mesh shaders or variable rate shading—it ran only as fast as its DX11 driver allowed.

If you are looking to run this specific legacy version today, here is a retrospective review of the system requirements and how they hold up. twinmotion 2016 system requirements