Run the "Wurst Installer.cmd" (Windows) or the cross-platform .JAR installer.
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 built-in OptiFine integration to improve performance and support shaders. How to Install Pobierz Wurst v6.13 MC1.12 OFPlik: Wurst-Client...
This update introduced official support for Minecraft 1.12.2.
The installation process for Wurst 6 differs from modern versions: Run the "Wurst Installer
The search for the specific file name "Pobierz Wurst v6.13 MC1.12 OFPlik" indicates a request for the for Minecraft version 1.12.2. Wurst v6.13 was specifically released to add support for Minecraft 1.12.2 . Overview of Wurst v6.13
Included a newer window-based GUI for managing various cheats. How to Install This update introduced official support
After a successful installation, a new "Wurst" profile will appear in your Minecraft Launcher. Common Keybinds