cygwin does not recognize crul command

You need to download cygwin package
the following extracted from

http://stackoverflow.com/questions/3647569/how-do-i-install-curl-on-cygwin

1) Find the cygwin setup.exe file from http://cygwin.com/ and run it. 
2) Click/enter preferences until you reach the "Select Packages" window. (See image) 
3) Click (+) for Net 
4) Click the entry for curl. (Make sure you select the checkbox for the Binary) 
5) Install. 
6) Open a cygwin window and type curl.exe (should be available now).

OR
Run setup-x86.exe -q -P curl in windows cmd window.