What browser are you using? I can take a look into this
Viewing post in Flipwitch Forbidden Sex Hex comments
I was able to download it with Firefox and Chrome without any issues. Do you perhaps have Windows Defender or another virus software that's false flagging it?
Im happy to provide a steam key if you can't get this working :)
**Note, from looking online this seems to be a Windows Defender thing not a browser thing so possibly windows defender is blocking the download