Oof GTK is probably one of the worst dependencies you can try and port to Windows.
What I’ve done in the past is use something like Onno Setup which can call a script during install.
Or, and this is new to me, use the Official tools to build a package for windows on whatever Linux distro you are on. From what I’m reading, it should package GTK with it.
That’s because the official instructions say to install it through snap. Which is just
snap install blender. You may have problems with flatpacks (I don’t to be fair) but that might be outside of the scope of this comment. Or just go to the app store and download it hahaAnd if you really want to install the deb package there are instructions to add the PPA.