MS does not want you to use Classic Shell in build 9879, and will block you from installing it. But you can beat the blocking by simply renaming the installer. I couldn't help but broke out laughing when I read that "work around" part. So easy and simple it's comical. http://news.softpedia.com/news/Microsoft-Blocks-Classic-Shell-in-Windows-10-Build-9879-465429.shtml I am just posting the news which I came across. My intention is not to initiate a debate on why we should or should not use it on a beta OS . Members can respond/remark/comment whichever way they wish.