If your version did not come with OptiFine bundled, download the 1.12.2 version of OptiFine and place it in the .minecraft/libraries or mods folder created by Wurst. Safety Warning
Includes built-in support for OptiFine (OF), which can be added manually to the mods folder or is sometimes bundled in the installer depending on the specific "OF" edition. Installation Steps Download Wurst v6.35 MC1.12 OF
Only download Minecraft clients from official sources like WurstClient.net. Downloading from third-party "re-upload" sites or YouTube description links can expose your computer to malware or account theft. How to Install Minecraft Hacked Client for 1.12.2 - Wurst If your version did not come with OptiFine
Ensure you have run this version at least once in your Minecraft Launcher. Wurst v6
You can find the specific archive for the 1.12.2 version on the official Wurst Client Download Page. Wurst v6.35 Minecraft Version: 1.12.2
Most Wurst versions for 1.12.2 use a standalone installer. Open the downloaded file and follow the prompts to create a new profile in your launcher.