Please contact me if you run into trouble. My email address is below.
source ('http://bioconductor.org/biocLite.R')
biocLite ('RCytoscape')
Now, start R and type these commands:
library (RCytoscape)
cy = CytoscapeConnection ()
pluginVersion (cy)
You should see
[1] "1.8"
Proceed now to read the vignette and/or browse through the cookbook examples.
Don't hesitate to send me questions if you run into trouble: pshannon AT systemsbiology DOT org