If you don't want to download anything, many "Unblocked Games" sites host the Tuff Client. Simply search for "Tuff Client Eaglercraft 1.12.2" and look for versions that mention "Full" or "Premium" features enabled. Optimizing Tuff Client for Maximum FPS
Access to capes, wings, and hats that other Tuff Client users can see.
Before joining a server, go to Options > Tuff Client Settings > Full Features . Ensure all toggles are unlocked. If you see a "Lite Mode" warning, you have the wrong version.