The first step is to get the library BiocInstaller from Biocondcutor. Hence we open an R session and run the following command:
source( "http://bioconductor.org/biocLite.R" )
Having the library BiocInstaller installed and loaded into the R session, the following commands will install rexposome and its dependencies:
biocLite("isglobal-brge/rexposome")