To download and set up Cygwin for 64-bit Windows, you generally use the official installer, as a pre-packaged "zip" download of the full environment is not officially provided. Instead, the installer handles the automated retrieval and extraction of compressed package files.
The standard way to get Cygwin is to download the setup-x86_64.exe from the official Cygwin installation page . This small executable acts as the package manager and downloader for the entire 64-bit environment. Installing and Updating Cygwin Packages cygwin 64 bit zip download