Simply go to R project page, select some German mirror site and download the precompiled binaries for your system, following the instructions on the webpage. In case of problems contact Derk Wachsmuth, who kindly agreed to help.
For meeting 5. and later, you'll need a standard installation of Bioconductor
Inside R type:
> source("http://bioconductor.org/biocLite.R")
> biocLite()