You could install first version, but how to install second version, as you automatically boot to the installed version? I looked on various sites including Macrium, and I saw dual booting was possible, but all videos referred to windows, linux where you can install linux as dual boot within windows. Problem was I could not find anyway of doing this. I decided (more out of academic interest than need) that I would setup windows 10586 in a vm on VMWARE, and also Insider version. I already have Server 2008 R2 loaded on a server.
I need to set up a dual boot between Server 2008 R2 & VMware ESXi on same server.