If it is a : Place the .jar file directly into your mods folder.
To download the Wurst Client v6.23 for Minecraft 1.12.2, you can access archived versions of the client through platforms like Internet Archive or official repositories like the Wurst Hacked Client SourceForge page. Download Wurst v6.23 MC1.12File: Wurst-Client-v...
Please note that for Minecraft 1.12.2, Wurst was typically installed as a standalone version or a mod. Modern versions of Wurst usually require the Fabric Loader . Installation Steps for Legacy Wurst (1.12.2) If it is a : Place the