Running R 3.03 on Windows 7

I am trying to install a package from a github repository.

https://github.com/google/glassbox

I downloaded the repository as a zip file, extracted it to get the glassbox
folder and re-zipped it with 7-zip.

I then ran

#-----------------Start code-------------------#

install.packages("C:/Users/jholland/Downloads/glassbox.zip", repos=NULL,
type="source")

#-----------------------------------------------------#

The output message said

Installing package into ‘C:/Users/jholland/Documents/R/win-library/3.0’
(as ‘lib’ is unspecified)

> library(glassbox)
Error in library(glassbox) : ‘glassbox’ is not a valid installed package

I'm not sure what I'm doing wrong.  When I look in the R library folder
(...R/win-library/3.0) I see the glassbox folder there.

I'm new to using packages not from the CRAN list so I'm trying to learn
fast.  I tried some searching and this seems to be what I'm suppossed to
do, but perhaps I need to use dev mode ?

Thank you for the help.

~James

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