I bought this tool and it worked really well especially because it was the only solution I found to get Frame Generation in windowed mode.
Since the latest update (3.1) the windowed mode has been removed and now all applications you try Lossless Scaling on will go "Full Screen" adding horrible black borders if the aspect ratio of the original app doesn't match the display one.
Despite many users purchasing this product, mostly because it offered that feature (check the official Discord for proof), the devs seem to have no plan to reintroduce it.
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I'm sorry to see the direction this project took and I'm sorry to say that if I pay something that offers me a feature and then said feature is taken away I'd call that a scam.
EDIT:
I forgot to mention the feature in question is still available should you choose to give up any future update to the app including new features and performance improvements and revert to an old build.
My bad for not even considering this a fair option to mention. Oh wait, because it isn't.