Versions marked "OF" (as in your query) include built-in OptiFine integration to improve performance and support shaders. How to Install
You can find the relevant version on the official Wurst website . Pobierz Wurst v6.13 MC1.12 OFPlik: Wurst-Client...
If downloaded as a .ZIP, you must extract the files rather than running them from inside the archive. Versions marked "OF" (as in your query) include