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devtools::install_github("google/CausalImpact")

Hi, I'm trying to install the CausalImpact package from github. However, I keep getting the error below. I have seen some code fixes posted previously for similar issues (something along the lines of PHP fixes; forgive my meager coding experience, but I have no clue what that even means), but none seem to work for me. What can I do to remedy this? I appreciate the help, thanks.

Downloading GitHub repo google/CausalImpact@master
from URL https://api.github.com/repos/google/CausalImpact/zipball/master
Error in curl::curl_fetch_memory(url, handle = handle) : 
  Peer certificate cannot be authenticated with given CA certificates
gturri
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BusinessJ
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  • It installed ok for me; I am on a Mac using R 3.2.3 and RStudio. You may want to give some version information that others may find useful (e.g. platform, R version, devtools version, RStudio version if relevant). – steveb Feb 24 '16 at 22:29
  • I can suggest downloading the package as a zip file, unzipping and then installing from this local copy. This may not work on Windows, though. – Michal Feb 25 '16 at 00:17

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