R installation
From AWF-Wiki
Installation of R 3.3.3 for Windows
Download the installer R-3.3.3-win.exe which conains a binary distribution of R-3.3.3 to run on Windows(including 64-bit versions of Windows). Just run this for a Windows-style installer with standard user rights not as administrator. During setup it is better to change the default installation folder to another folder (e.g. to C:\OSGeo4W\bin\apps\R\R-3.3.3) because write access to this folder is needed using the QGIS Processing Toolbox.
