How do I use Bioconductor and sangerseqR in R?

Question

I want to use sangerseqR for .ab1 files. Searching for how to use it in R,

source("http://bioconductor.org/biocLite.R")

gives me a error message.

Error in file(filename, "r", encoding = encoding) : 
   cannot open the connection
In addition: Warning message:
In file(filename, "r", encoding = encoding) :
   unable to connect to 'bioconductor.org' on port 80

Is it compatible only with certain versions of R ? Or do I need to have some other packages installed before I can run Bioconductor ?