Now that the Anniversary update is through and Win 10 free update period has finished, Microsoft is now offering a 90 free trial of the Win 10 Enterprise version. (LTSB means Long Term Support Branch)
Why would I want this some will say ? (apart from the cost to buy). Well for starters it is sort of a pure Windows version of 10.
No Metro apps such as Edge, Xbox, Cortana and the Store.
More info and link to iso download and trial key are here
http://www.askvg.com/download-windows-10-enterprise-free-90-day-trial-version/