How To Uninstall Wurst 6
A step-by-step guide that works on Windows, Linux and Mac!
Remove Wurst from the versions folder
Remove the Wurst folder(s) from your .minecraft/versions folder.
To get to your .minecraft folder, open Windows Explorer and type/copy %appdata%/.minecraft into the address bar.
Then enter the "versions" folder and delete the "Wurst" folder(s).
(If you are using Linux or Mac then the path to your .minecraft folder will be different. Please check the Minecraft Wiki for that part.)
Optional: Remove Wurst's settings
Go back up to your .minecraft folder and delete the "wurst" folder inside.
This folder contains all of Wurst's settings. If you are trying to fix something by reinstalling Wurst, you should probably delete at least the "enabled-hacks.json" file inside of this folder.