Download old versions of Android Developer Toolkit ADT

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You can find the old versions of the ADT at the following URLs (it looks like Google keeps them around, but doesn't advertise how to locate them).

• http://dl.google.com/android/ADT-0.9.5.zip
• http://dl.google.com/android/ADT-0.9.6.zip
• http://dl.google.com/android/ADT-0.9.7.zip
• http://dl.google.com/android/ADT-0.9.8.zip
• http://dl.google.com/android/ADT-0.9.9.zip
• http://dl.google.com/android/ADT-8.0.0.zip
• http://dl.google.com/android/ADT-8.0.1.zip
• http://dl.google.com/android/ADT-10.0.0.zip
• http://dl.google.com/android/ADT-10.0.1.zip
• http://dl.google.com/android/ADT-12.0.0.zip
• http://dl.google.com/android/ADT-14.0.0.zip
• http://dl.google.com/android/ADT-15.0.0.zip
• http://dl.google.com/android/ADT-20.0.0.zip
• http://dl.google.com/android/ADT-20.0.3.zip
• http://dl.google.com/android/ADT-21.0.0.zip
• http://dl.google.com/android/ADT-21.0.1.zip
• http://dl.google.com/android/ADT-21.1.0.zip
• http://dl.google.com/android/ADT-22.0.0.zip
• http://dl.google.com/android/ADT-22.0.1.zip
• http://dl.google.com/android/ADT-22.0.4.zip
• http://dl.google.com/android/ADT-22.0.5.zip
• http://dl.google.com/android/ADT-22.2.0.zip
• http://dl.google.com/android/ADT-22.2.1.zip
• http://dl.google.com/android/ADT-22.3.0.zip

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From: http://stackoverflow.com/questions/4710107/where-can-i-find-older-versions-of-eclipse-adt