From

../ReadMe
in the mentioned web resource:

"Packages for R >= 1.7.0 and R < 3.2.0 are available from
https://cran-archive.r-project.org/bin/windows/contrib/";

We do not hold binaries of several year old versions of R on CRAN.

Note that R 3.0.0 is 7 years old. You shoudl realy consider to update to 4.0.2.

Best,
Uwe Ligges




On 05.10.2020 09:56, Steven Yen wrote:
I had to install/use an older version of (R-3.0.3) for a reason. While
installing a package from CRAN (either in RStudio or R), I received the
following warning message saying unable to access index for repository
http://cran.rstudio.com/bin/windows/contrib/3.0. See message below. In
this case, I tried to install "aod". The install nevertheless went
through, as confirmed by the library statement (I did not try to use
it). Any idea? Thank you.

=====

Warning: unable to access index for repository
http://cran.rstudio.com/bin/windows/contrib/3.0 Warning: unable to
access index for repository
http://cran.rstudio.com/bin/windows/contrib/3.0 >
install.packages("aod") Warning in install.packages : unable to access
index for repository http://cran.rstudio.com/bin/windows/contrib/3.0
Warning in install.packages : unable to access index for repository
http://cran.rstudio.com/bin/windows/contrib/3.0 package ‘aod’ is
available as a source package but not as a binary Warning in
install.packages : package ‘aod’ is not available (for R version 3.0.3)
  > library(aod)


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