Yes. The intent of the load balancing feature is to ensure high availability (HA) of RStudio Server Pro. RStudio uses its load balancing feature to choose the best node in the cluster to start a new R session. The same version of RStudio Server Pro must be installed on any participating node and a license must be purchased for every RStudio Server Pro installed. Please read the load balancing section in the RStudio Server Pro admin guide (http://docs.rstudio.com/ide/server-pro/latest/) for a complete explanation.