This upscaler is not mine, all the credit go to: wilzamguerrero
Official page where to download: https://huggingface.co/uwg/upscaler/blob/main/ESRGAN/8x_NMKD-Superscale_150000_G.pth
HOW TO USE:
Download the file .pt
Copy the file
Open your stable diffusion installation folder
Paste the file in the folder: "\stable-diffusion-webui-1.7.0\models\ESRGAN"
Restart the webui
Now you can use the upscaler!