Upgrading Mingle from 2.3.1 to 12.2

To upgrade Mingle from 2.3 to 12.1 (windows) you will need to take the following route

2.3.1 -> 3.1
Instructions: http://www.thoughtworks-studios.com/mingle/3.1/help/upgrading_from_mingle_2_3_1.html
Mingle3.1 installer: http://download01.thoughtworks.com/mingle31/mingle_windows_3_1_18085_5a8ffb502c6a.exe

3.1 -> 3.3.1

Instructions:http://www.thoughtworks-studios.com/docs/mingle/3.3.1/help/upgrading_from_mingle_3_3.html
Windows:Mingle 3.3.1 installer:http://download01.thoughtworks.com/mingle331_bf2/mingle_windows_3_3_1_25110_b8fcfb9df087.exe

Linux: http://download01.thoughtworks.com/mingle331_bf2/mingle_unix_3_3_1_25110_b8fcfb9df087.tar.gz

3.3.1 --> 12.2
Instructions: http://www.thoughtworks-studios.com/docs/mingle/current/help/upgrading_from_previous_versions.html
Mingle 12.2 installer: http://download01.thoughtworks.com/mingle/12.2.1/mingle_windows_12_2_1_7b79946.exe

Linux:http://download01.thoughtworks.com/mingle/12_2_2/mingle_unix_12_2_2_6b54e82.tar.gz