Download a portable version of your chosen launcher (Prism Launcher offers an excellent portable .zip version).
Verify that both Web Displays and MCEF are built for version 1.16.5. Mixing versions (like using a 1.12.2 MCEF core with a 1.16.5 Web Displays mod) will cause immediate crashes. web displays mod 1165 download portable
Extract the launcher folder to your desired location, such as a USB drive or a dedicated desktop folder. Download a portable version of your chosen launcher
Ensure you download the version of MCEF that matches your Minecraft version (e.g., MCEF 1.11 for Minecraft 1.12.2). MCEF 1.11 for Minecraft 1.12.2).