WoW laucher allow you to downgrade automaticly wow 4.3.4 to wow 4.0.6 automaticly change realmlist to your private server realm you need to edit the source to change the realmlist

1. Downgrade
   

When you click on play button the are are automaticly downgrade to wow 4.0.6

2. Automatique Update
   

This application have an auto-updater already include you only need to change the link to your release

3. Multilanguage Support
   

This application support all major language of wow client Language supported : frFR , EnUS , EnGB

4. Realmlist Changer
   

This application allow you to change realmlist quickly You can store 5 realmlist and swap quickly

5. Unpatcher
   

This application backup all your original file so you can patch your official WoW client and after that unpatch to original WoW I recommand to backup your WoW client also in case or error.