As it's a patreon exclusive, uploading it here would technically be theft. You can sign up to pasty's patreon to get access to it.
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WinRAR or 7zip. I personally use WinRAR because it will ask you to pay for the full version from now until eternity every time you open it but it'll never force you to do so and as long as you "unzip to [file name]" through the right click menu then it'll never even ask. Also 7zip is open source but WinRAR is proprietary so any files zipped with it (and there are a lot) can only ever be unzipped with WinRAR.
Well, assuming your on desktop, after you right click the zip file, you click "Extract to "THWETHB"". Once it's done extracting, you go to the folder of the same name and find the executable. The folder should have one or two files in it (one of them being the executable AKA the actual game) along with a bunch of folders. just click on the executable to start the game.