How to Install Cygwin Offline in Windows 7

Here are instructions assuming you want to install Cygwin on a windows computer with no Internet connection. I assume that you have access to another computer with an Internet connection. Start on the connected computer:

cygwin is Linux environment and command-line interface for Windows

To know completely about cygwin click here.

Cygwin uses a small setup file to download the large setup file from the mirrors.
You can install cygwin in 2 ways.

• 1. Install cygwin online.
• 2. Install cygwin offline.

STEPS TO DOWNLOAD.

• 1. Download the cygwin setup file from here.
• 2. Run the downloaded setup file as an administrator.
• 3. Click "Next".
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• 4. Select "Download Without Installing" and then "Next"

• 5. Select the local folder in which you should place your setup files by clicking "Browse.."
• 6. Select the folder to download offline installer files and then "OK"

• 7. Choose your internet connection method which by default is 'Direct Connection'.

• 8. Select the mirrors from which site your setup file should be from and click "Next".

• 9. Wait for the original set up file to be downloaded.

• 10.Choose the packages you want and click "Next"

• 11.Wait for the download to complete. It may take 5-10 Minutes depending your connection speed and selected mirror.
• 12.Click "Finish".

• That's it!! Now you have offline installar to install cygwin offline.
  On the target computer, run "setup.exe"
  Copy downloaded directory, along with the "setup.exe" program, over to your target computer
  On the target computer, run "setup.exe"
  When the setup asks "Choose a download source", choose Install From Local Directory
  Complete setup as usual. No Internet access is required.