@MikeK glad you found a solution. For the R community nodes I found it best to combine it with RSclient and control it like this. You will have to set the port in the KNIME preferences.
library(Rserve)
library(RSclient)
Rserve(port = 6311, debug = FALSE, args = “–vanilla”)
# start the RServe(er)
rsc <- RSconnect(port = 6311)
# shutdown the server after you used it
RSshutdown(rsc)
I collected some articles about KNIME and R. I typically would use the “official” version: