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In v4.0, the "KRestartSampler" node can be installed from:

https://github.com/ssitu/ComfyUI_restart_sampling

The dequality node is included in the zip file, and you just need to add it to your custom_nodes directory and restart ComfyUI.

v2.x now uses the new ComfyUI nodes for Cascade. Make sure you update it and install the models as recommended:

https://huggingface.co/stabilityai/stable-cascade/tree/main

stage_b.safetensors and stage_c.safetensors (you can use the bf16 versions) go in ComfyUI/models/unet

stage_a.safetensors goes in ComfyUI/models/vae

and this: https://huggingface.co/stabilityai/stable-cascade/blob/main/text_encoder/model.safetensors goes in the ComfyUI/models/clip/ folder to be loaded with the Load CLIP node in the workflow

The SDXL workflow includes wildcards, base+refiner stages, Ultimate SD Upscaler (using a 1.5 refined model) and a switchable face detailer.

Now with controlnet, hires fix and a switchable face detailer.

I'd recommend installing all the custom node packs shown in the resources, and also these:

https://github.com/chrisgoringe/cg-use-everywhere
https://github.com/bash-j/mikey_nodes

https://github.com/twri/sdxl_prompt_styler

https://github.com/Derfuu/Derfuu_ComfyUI_ModdedNodes

https://github.com/BadCafeCode/masquerade-nodes-comfyui

https://github.com/space-nuko/ComfyUI-OpenPose-Editor

https://github.com/ssitu/ComfyUI_UltimateSDUpscale

https://github.com/pythongosssss/ComfyUI-Custom-Scripts