There are 2 .rar files:
One file with the needed files, the Itemmanager and the injector files.
It includes also some runtime files to provide compatibility.
If this version doesn't work for you, download the second .rar file, the one with the setups.
First run the Setup.exe and then Setup.msi.
Please read the ReadMe.txt in the first .rar file or the instructions in the installer, they include important information about the injector and the Itemmanager!
Unpack the files into the S4 folder or choose it as installation path in the installer.
For those with blind eyes