No official Eaglercraft 1.20.1 exists from the original developer (lax1dude). Community “exclusive” builds are shared via:
SYSTEM: 115 blocks.
Verify that hardware acceleration is enabled in your browser settings to utilize your GPU for rendering. Key Features and Servers eaglercraft 120 1 exclusive
However, if you have been dying to use a Brush on suspicious gravel or ride a Camel while sitting in a boring history class, this is the best way to do it. No official Eaglercraft 1