*Here: https://github.com/RavenProject/Ravencoin/releases
*Download this file: raven-4.1.0.0-win64.zip (24.2 MB)
*Unzip, enter "\bin" directory and start raven-qt.exe

If you do this, there would be no need to download whole blockchain again (only update, probably few percents, meaning 5-10min of waiting).
This works to me.