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
You can use these in Eclipse by first downloading the desired ADT zip to your local drive, then choosing “Install New Software”, “Add Site”, “Archive”.