Razor Enhanced require Microsoft .NET Framework 4.5. If not sure of your version or not have it download from official Microsoft site: Download .Net Framework 4.5
Razor Enhanced require Visual C++ Redistributable. If not sure of your version or not have it download from official Microsoft site: Download Visual C++ Redistributable
Razor Enhanced use IronPython to power it's scripting engine, in order to access all the additional features and library offered by IronPython and being able to relay on the Official Documentation it's necessary to download and install from the official site: IronPython Download