I am trying to add this to my 1.20.1 world and it auto-installs version 2.0 of this mod on curseforge, You get the prompt when booting up you need 1.3.4 instead. when you switch to this version you get the error exit code: -1 message screen.

The game crashed whilst initializing game
Error: java.lang.NullPointerException: Initializing game
-1

Install WaterFrames 2.0-beta5.1 to use watermedia 2.0.x

I transferred the issue to WaterFrames because is not even watermedia related