You can choose to build SparkleShare from source or to run the Windows installer.
Install version 4.0 of the .NET Framework if you haven't already.
Install msysGit and copy the contents of the install folder
(C:\Program Files (x86)\Git by default) to C:\path\to\SparkleShare-sources\bin\msysgit\ (create the "bin"-folder in the SparkleShare source directory).
Open a command prompt and execute the following:
cd C:\path\to\SparkleShare-sources
cd SparkleShare\Windows
build
C:\path\to\SparkleShare-sources\bin should now contain SparkleShare.exe, which you can run.
To create an installer package, install WiX 3.7, restart Windows and run:
cd C:\path\to\SparkleShare-sources\SparkleShare\Windows\
build installer
This will create SparkleShare.msi in the same directory.
Remove My Documents\SparkleShare and AppData\Roaming\org.sparkleshare.SparkleShare (AppData is hidden by default).
You can uninstall SparkleShare through the Windows Control Panel.