Hi there, i have modified the ESRGAN code to support more models, i tested with a bunch from https://openmodeldb.info/ and some work out of the box but some of them had to be converted with :

import torch
checkpoint = torch.load(r"model.pth",map_location="cpu")
torch.save(checkpoint,r"model_converted.pth",_use_new_zipfile_serialization=True)

I have also tested with x2 and x1 models from that web and some of them works ( 2x-ESRGAN.pth , 1x-Anti-Aliasing.pth )
It also supports RealESRGAN_x4plus.pth as well as the original RealESRGAN_x4plus_anime_6B.pth

PD: I'm integrating stable-diffusion.cpp into Nuke wich is a vfx software , my repo is here -> pc_nuke_diffusion, still early development but most of the cli options are avaliable there already.