This is a binary release candidate of Stahp It for Windows Vista and later. The x86 version includes the 64 bit WinDivert driver, so it will function correctly if installed on a 64 bit OS as well.
Once you've installed, you may want to read the Wiki page about adding filtering categories. This is where blocking rules get loaded.
Hashes
File name: StahpIt-WPF-x86-1.0.0RC1.msi
SHA256: f691802a72ea9aa0cc8e74f3cfca4e07fd6f24e0c4c5dc371874a58d67d2fe75
Virus Total Analysis here.
File name: StahpIt-WPF-x64-1.0.0RC1.msi
SHA256: 9d38d76a9ca67a5cacea6e60af3058a4950fa709dc6ef59f44ef5f49f27eaaa8
Virus Total Analysis here.
There are bound to be issues. Please take a moment and report any issues you encounter. Thanks!