This is not intended for use as a LORA or Standalone checkpoint.
Rename this file to RealESRGAN_x4plus.pth and copy to the RealERSGAN folder to use as an up-scaler.
Recommend to back up or rename the RealESRGAN_x4plus.pth found at:
webui\models\RealESRGAN
Credit to the up loader of HAT and Real ERSGAN this is simply a workaround to use in Stable Diffusion WebUI until an add-on is made. (Or inspire someone to do just that)