install.packages(c("JGR","Deducer","DeducerExtras"))
Sys.setenv(NOAWT=1)
library(JGR)
Sys.unsetenv("NOAWT")
JGR()
You should now see the Data and Analysis menus and a spreadsheet like data viewer. If you would like to have Deducer load every time JGR is started, go to 'Packages & Data' -> 'Package Manager' and check the 'default' check box next to Deducer.
Sys.setenv(NOAWT=1) in R prior to installing