Download & Install Android tools, platform-tools (Offline)

Download Offline Platform-tools , Tools & Sources to work in ADT

Android SDK Platform-tools
Save the Following under ~\..\android-sdk-windows\platform-tools\

Android SDK Tools, revision 21.1

Ignore this if you have already downloaded "Android SDK". To Update Replace the whole tools folder

~\..\android-sdk-windows\<tools>

with the below downloaded archive.

tools_r21.1-windows.zip
tools_r21.1-linux.zip
tools_r21.1-macosx.zip

Android SDK Platform-tools, revision 16.0.2 

~\..\Android SDK Windows\<platform-tools>

platform-tools_r16.0.2-windows.zip
platform-tools_r16.0.2-linux.zip
platform-tools_r16.0.2-macosx.zip