Hello,

I'm trying to upgrade R from 3.0.3 to 3.1 on MacBookPro Mavericks 10.9.2.
After downloading R-3.1.0-mavericks.pkg from http://cran.stat.ucla.edu/ and
clicking it, I get the following error message:

"R-3.1.0-mavericks.pkg can't be installed because its digital signature is
invalid".

I checked the md5 signature with md5sum and it matches that found on the
download page. I also tried re-downloading the package from different
mirror sites and I get the same error. I also tried R-3.1.0-snowleopard.pkg
but I got the following error:

"This package was signed with an invalid certificate. This package might
not install what you expect."

But unlike the mavericks.pkg, the snowleopard.pkg provides me the option to
continue the install in spite of the warning.

Why am I getting these 'invalid' warnings? How do I securely and properly
install R 3.1 on my Mac that is running Mavericks? It is strange that just
a few weeks ago, I did not have these problems installing R 3.0.3.

Thank you for your help,

Paul

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