Installing new version of data.table (specifically 1.8.11 from Rforge)

Installing new version of data.table (specifically 1.8.11 from Rforge)

According to
https://r-forge.r-project.org/scm/viewvc.php/pkg/NEWS?view=markup&root=datatable
datatable now has melt.
I saw that and went to download data.table 1.8.11 and when I went to
install it I got an error that it is unavailable for R 2.15.3 (which is
the version I was on). Based on that I updated to R 3.0.1 and tried to
install it again...
> install.packages("C:/[path]/data.table_1.8.11.zip", repos = NULL)
Warning in install.packages :
package 'C:/[path]/data.table_1.8.11.zip' is not available (for R version
3.0.1)
package 'data.table' successfully unpacked and MD5 sums checked
if I do packageVersion("data.table") I get 1.8.11 but if I do
?melt.data.table I get there's no documentation for it.
If I uninstall data.table I can then reinstall data.table 1.8.10 from CRAN
without getting any errors.
Does anyone know why I'm getting these errors with the newer version of
data.table? As you can tell from the C drive path I'm on Windows.