@icyrotten Might need to update that one to be honest, it just pulls dxwebsetup.exe from an archive.org link, which (probably?) doesn't install properly as it needs to download files from M$, and if they 404'd the initial download I assume the web setup (which grabs files from somewhere) is broken.
I'll investigate soon, but the "fallback" solution is to just run DXSETUP from inside the game(s) redist/DirectX folder.