Ah I see, thanks for the clarification. Feel free to delete this one too, but I can guarantee youll get more since theres a pop-up telling you to run something on first launch
They probably meant the promt to allow the installation of prerequisites through the Itch manager. Usually it's about getting some Redist, DX or Platform specific libraries (Here most likely the UEPrereq). Needs elevated rights too, so it's a good thing if people look twice there - but claiming it's a virus with no foundation is not.