This issue seems to be ongoing.
I am not the only one at my organization experiencing it either.
Downloading the source and trying to unzip it reveals the file is broken.
We are running R version 3.1.1 (2014-07-10) on Windows 7 64 bit.
Issue:
install.packages("XML")
trying URL
'http://cran.rstudio.com/bin/windows/contrib/3.1/XML_3.98-1.1.zip'
Content type 'application/zip' length 4289878 bytes (4.1 Mb)
opened URL
downloaded 4.1 Mb
Warning in install.packages :
downloaded length 4253160 != reported length 4289878
Warning in install.packages :
error 1 in extracting from zip file
Warning in install.packages :
cannot open compressed file 'XML/DESCRIPTION', probable reason 'No
such
file or directory'
Error in install.packages : cannot open the connection
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