DGSEA can be found on GitHub. We are in the process of putting DGSEA on Bioconductor, but for now it can be directly installed using devtools in R:

if (!require(devtools)) {
  install.packages('devtools')
}    
devtools::install_github('JamesJoly/DGSEA')

Check out the Running DGSEA page to see how to format your data to run your first analysis. Please file all bugs/feature requests at DGSEA’s GitHub repo.