(Windows) R interpreter on Windows

Hi,
I successfully run the latest release of Zeppelin on windows 10 (which work great) and query my Cassandra database using the integrated interpreter.
I am new to Zeppelin and I would like to analyze data and visualize results using the R interpreter. Zeppelin documentation says to set the SPARK_HOME environment variable, but I don't have Apache Spark and I'm also new to it.
Do I need to get Spark on my local machine (I know that Zeppelin provides a built-in Apache Spark integration) or can I use an R interpreter alone ? I already have R and add it to my PATH but it not seems to work..
Do the latest version of Zeppelin integrates a standalone R interpreter and if so, do anyone know how to set it up on windows ?
Thanks a lot.