Hi Adresrcs
Thanks for you help.
As per your advice, I have installed Rtools then used following command to install ggbiplot in local directory
.libPaths( c("C:/Data/R_Package/Library", .libPaths() ) )
Then I used following commands to install ggbiplot
library(devtools)
install_github("vqv/ggbiplot")
It worked OK

Abdur