Unofficial Updater 2 can only be run against Adobe ColdFusion 8.0.1 or 9.0.1. Once you download Unofficial-Updater2.jar from https://github.com/dcepler/unofficial-updater2/downloads on most systems you can just double click the file and it will start. If you get a tools.jar missing error, you need to run it via the command line. The installer will default to the appropriate install type either GUI or text based.
See the readme file at https://github.com/dcepler/unofficial-updater2 also for more details
If you need to run from command line:
java -jar Unofficial-Updater2.jar
If you want to force text based:
java -jar Unofficial-Updater2.jar text
If this is the first time using Unofficial Updater 2 you will get the following screen:
All the directory inputs are defaults and should be modified for your installation either by using the text input or the "Select Folder" button.
Assuming everything went ok you will get the Finished dialog
At any point if Unofficial Updater 2 fails you will get the following dialog
Please copy all the text from the Output and Errors tab and file an issue on github