If your just testing I think there are Technical Previews. For example Parrallels for OS X has an easy way to download them. I think you could probably get some

If your just testing I think there are Technical Previews. For example Parrallels for OS X has an easy way to download them. I think you could probably get something similar for Linux via something like this https://insider.windows.com/ https://insider.windows.com/