Download the JAR file directly from the official WurstClient.net download page 1.3.3. Press Windows Key + R . Type %appdata%\.minecraft\mods and hit Enter. Note: If the mods folder doesn't exist, create it. Install Wurst and Fabric API:
A user-friendly, modular interface (Right-Shift to open) 1.3.3. Over 100+ Hacks: Including Fly, Killaura, X-Ray, and Speed. Download Wurst v7.0pre1 MC1.14.4File: Wurst-Cli...
If you're having issues, are you seeing a specific when launching? Also, Download the JAR file directly from the official WurstClient