Your tool helped me a lot, yes it just stopped out of nowhere, I use Windows 10 RTX 3050 and GPU, and I never had any problems... your program opens normally but it keeps upscaling forever and never finishes...
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OK, I'll look into it.
If you can use command line program, i recommend using the original program that I use in this software, to try if it run or not.
https://github.com/xinntao/Real-ESRGAN#-quick-inference