I routinely downloaded it from a pirate site, but I see that it's available here: https://www.microsoft.com/en-us/evalcenter/download-windows-...

Works well without activation, if you don't mind the overlay. But what I did is that I pointed it at a KMS emulator, which is a piece of software that responds to every activation request as a positive. The internet is full of lists of servers like these, but I host it myself - basically just built and compiled this one: https://github.com/Wind4/vlmcsd