guessing you got the free version 2.9 from the internet archive?
That is just a pirated version of the official program that someone uploaded to github without the purchase checks in place.
It then got taken down.
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not so sure how safe the version uploaded to the internet archive is, I'd run it through a virus checker and then double check it doesn't make any network traffic while it's running if I was you.
all of that was just a preface to say:
use this instead if you don't want to pay:
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A free and open source windows 10/11 program upscaler.
8.5k stars means it's definitely safe and it's also pretty good at what it does.
recommended by a netizen fossware advocate.
P.S. linux users have gamescope.