Blender 4.2 and newer. It is tested on Blender 4.2, 4.5 and 5.2 LTS.

No. Generation runs on your computer with the engine you install. Only the engine files and model weights are downloaded, once, into a folder you choose.

TRELLIS.2 runs on Apple Silicon Macs and Windows x64 (the Windows Vulkan runtime is experimental). Hunyuan 2.1 MLX and UltraShape need Apple Silicon, and Hunyuan needs macOS 15 or newer. TripoSR is an experimental CPU engine. Apple Silicon with 24 GB or more memory is recommended.

That depends on the engine. Each model and its weights have their own license: Hunyuan 2.1 excludes the EU, UK and South Korea, and the DINOv3 weights used by TRELLIS.2 carry Meta's terms. The add-on cannot grant rights the model licensors do not give, so review the terms of every engine you install.

It depends on the picture and the engine. Overall shapes are usually recognisable, but small text and logos can be soft and textures can show speckles. Treat the output as a strong starting point and check it before you use it.