I think this guide is outdated.
It mentions version 1.15.1 at the top, then asks us do download a dev.zip file, and then extracting a master.zip file, that we haven't been intructed to download. And after that it wants us to go to a folder named nginx-1.13.1, which doesn't exist, because we downloaded the 1.15.1.
If I extract the 1.15.1 file and the dev.zip, the installation in the next steps fails.
same if I download the 1.13.1 file and master.zip, although I get a different error.
I'm using ubuntu in windows.
I missed a couple spots when I recently updated the guide for a newer version, thanks. The correct files are nginx-1.15.1.tar.gz for nginx and dev.zip for the rtmp module.