This workflow is basically just a workaround fix for the bug caused by migrating StableSR to ComfyUI.

Source:  https://github.com/gameltb/comfyui-stablesr

The best way to install StableSR for ComfyUI in Windows is to go to your 'ComfyUI\custom_nodes' directory, open a CMD prompt, then type "git clone  https://github.com/WSJUSA/Comfyui-StableSR.git" (no parenthesis). Then start ComfyUI.

I won't include instructions for Linux users as you probably already know what to do.

Models required:

• Put the StableSR webui_786v_139.ckpt model into Comyfui/models/stablesr/
• Put the StableSR stablesr_768v_000139.ckpt model into Comyfui/models/checkpoints/
• Download the ckpt from HuggingFace https://huggingface.co/Iceclear/StableSR/

Updated: added a FreeU v.2 node which provides superior results compared to without.