Near the top of the R2 Platform Tool view is the “Current R2 Installation” path on your Workbench PC.

This path is initially set when you run the Install Niagara R2 wizard for a selected JACE-603 or JACE-645. Typically, you leave this at that release directory, which should be 2.301.535 or later.

If necessary, you can change it by clicking the open folder icon. This opens a popup directory chooser dialog, which you can use to name another (say newer) Niagara R2 release folder.