Open Comfy Desktop — install only if needed
Already have a working, current ComfyUI? Skip installation and continue to the workflow choice below. Otherwise: Download the Windows installer, open the .exe and follow the setup screens. Launch Comfy Desktop from the Start menu. Choose New Instance → Standalone, the Stable channel and NVIDIA (CUDA) when the hardware options appear. Let the app install Python and dependencies for you; no separate Git or Python setup is needed. Use the current NVIDIA driver. For RTX 20-series and newer, including RTX 5090, select the recommended stable CUDA build; respect any driver or GPU-compatibility warning. When ready, click the instance card to open ComfyUI. In the card’s ⋮ → Manage → About, confirm the expected GPU and PyTorch backend rather than CPU before downloading large files.
Download Comfy Desktop Official Windows installation NVIDIA driver downloads