Download Wurst V6.34.1 Mc1.8 Offile: Wurst-clie... Info

Click the Install button. A message should appear confirming successful installation. Step 2: Add OptiFine

Do not just open the downloaded Wurst ZIP file; you must extract its contents to a folder. Download Wurst v6.34.1 MC1.8 OFFile: Wurst-Clie...

Alternatively, you can install OptiFine separately by right-clicking the file and selecting "Open with Java" to run its own installer. Click the Install button