how to install apt-cyg for Cygwin?

You can do this with just the browser.

1. Right click on the "https://raw.githubusercontent.com/transcode-open/apt-cyg/master/apt-cyg" link
2. Select "Save link as"
3. Navigate to c:\cygwin\bin (or wherever your Cygwin binaries live)
4. Remove the .txt extension so that it's just apt-cyg
5. Click "Save"
6. Run chmod in bash as shown

You install it like this:

1 - Make sure lynx is installed

2 - Run lynx -source rawgit.com/transcode-open/apt-cyg/master/apt-cyg > apt-cyg

3 - Run install apt-cyg /bin

That's it!